The wait is almost over. Come Monday's keynote at Apple's annualWorldwide Developers Conference, odds are we'll get a look — perhaps not the first, after all those crazy leaks — of the next iPhone, complete (supposedly) with a new, flatter shell, dual cameras, and a higher-resolution display. But what else will Steve Jobs pull out of his bag of tricks?

Fourth-generation iPhone
Barring a jaw-dropping surprise from Apple, we've probably already seen the new iPhone, thanks in part to a hapless Apple engineer who lost a prototype (or had it stolen from his backpack, depending on whom you believe) a couple of months ago. Gizmodo paid a $5,000 finder's fee to publish detailed photos and videos of the handset in a series of blog posts. Additional snapshots from another purported leaked iPhone later surfaced in Vietnam.

The handset they documented would represent the most radical change in the iPhone's form factor since the original iPhone debuted in 2007. The curved back of the iPhone 3GS would be  replaced with a smooth, flat ceramic shell, complete with flat aluminum edges and buttons.

Also new, according to the bloggers who poked and prodded the prototypes: a revamped, higher-resolution display (960 by 640, to be exact, or twice the resolution of the original iPhone), dual cameras (one in back with a flash, the other in front, apparently for video chat), a version of Apple's new A4 processor (the same one that powers the iPad), and a larger battery. The phone is also thinner than the iPhone 3GS, but slightly heavier than the current 4.8-ounce model, the bloggers said.

That's what we (think we) know. What we don't yet know is how much the new iPhone will cost or what storage capacities will be available. The 32GB iPhone 3GS goes for $299 with a new, two-year AT&T contract; the 16GB version sells for $199 with service. Will Apple stick to $299 as the upper end of its price range, and will it double the capacity of the priciest iPhone (to 64GB, in this case) as it has in years past? Will the current $99 8GB iPhone 3G be phased out? We'll have to wait and see.

Other question marks: the exact resolution of the new camera(s); whether and how AT&T will support video chat, assuming the front-facing camera is the real McCoy; whether the iPhone is coming to other carriers, namely Verizon (maybe eventually, but probably not Monday); the precise day when the next iPhone goes on sale; and what the new iPhone will end up being called. (The iPhone HD? 4G? Something else?)

iPhone OS 4.0
The most dramatic change coming to the iPhone has, in fact, already been announced: multitasking for third-party apps, which will arrive as a feature in the latest version of the iPhone operating system. Also coming in iPhone OS 4.0: a universal e-mail inbox, home-screen folders, a social-gaming network, and support for Apple's new iAd mobile advertising platform. Of course, we already got most of those details during an Apple presentation in April; hopefully, we'll get an exact release date at Monday's keynote.

iTunes in the cloud?
Here's where we start wandering deeper into rumorville, with speculation that Apple might launch an "in the cloud" version of iTunes because of its acquisition of Lala earlier this year. Sounds like a good idea — and an inevitable one — but All Things Digital's Peter Kafka thinks such an "iTunes.com" service is still a long way off, pending "negotiations with the [music] labels."

Revamped $99 Apple TV?
One of the hotter rumors last week had it that Apple was primed and ready to get serious with its Apple TV "hobby," staring with a new, compact Apple TV device with a minimal amount of flash storage and powered by the iPhone OS — and best of all, it would cost just $99. It's a nifty idea, especially if it meant streaming movies and TV shows from iTunes rather than having to store them on your Mac's hard drive. It would also be a logical move in response to the upcoming Google TV. But Jobs poured cold water on the rumor this past Tuesday, telling conference-goers at D8 that "nobody's willing to buy a set-top box" because they're used to getting cable/satellite set-top boxes for free. A new, cheaper Apple TV still might happen, but the conventional wisdom is that it won't arrive Monday.

Free MobileMe?
MobileMe — a service that syncs contacts, calendar events and an in-the-cloud "iDisk" among  Macs, iPhones, iPod Touches and iPads — launched back in 2008 and landed with a thud after early adopters found themselves locked out of their Apple mail, unable to log into the MobileMe Web interface, and stuck with calendars and contact books that were hopelessly out of sync — oh, and the $99-a-year subscription fee didn't help.

Steve Jobs ended up apologizing for the snafus, and Apple eventually managed to iron out the kinks (indeed, as a MobileMe subscriber myself, I can attest that the service is running more or less smoothly now), but MobileMe's image never really recovered from its early black eye. Nixing the $99 annual fee would be a great incentive for users to give MobileMe a second chance, however, and rumor is that such a move could be announced Monday.

One more thing ... 
Steve Jobs promised last month that despite all the leaks, we "won't be disappointed" by Monday's WWDC announcements. Is another dramatic "one more thing" on the agenda? Maybe the long-awaited (if long-shot)Verizon iPhone, that new Apple TV I just mentioned, an iPod Touch with a camera, or something else out of left field?

We'll find out soon enough. Yahoo! News' coverage of Steve Jobs' WWDC keynote will begin Monday at 10 a.m. PT sharp, starting with a live blog by Chris Null and commentary by yours truly. See you then.

— Ben Patterson is a technology writer for Yahoo! News.