Tonight's Apple event is almost certainly on the iPad 2. So what are we likely to see?
Faster processor and more memory are pretty much a given, though it's unlikely that these will be called out during the presentation itself. What's more likely is the storage size will be bumped - 64G will be the minimum and 128G will be an option. It's pretty unlikely that a 256G will show up at any reasonable price point - look at the MacBook Pro SSD upgrades to get a feel for the pricing.
As much as I'd like a new retina display, I suspect they aren't going to rev that in sufficient quantities for another year or so. If they are pre-announcing a product now for shipping in autumn, then maybe - but with the old SKUs being wiped out it's fairly likely to be shipping in days or weeks rather than months.
FaceTime camera and support is a given, though I don't know how they will demo it without NostrilView (tm). Maybe propped up on a desk, perched on a figure of Steve Jobs purchased from eBay? Unlikely to be on a wall - they want to demo the portability of the device, even if a WallCam (tm) looking like a prop from a Harry Potter movie would make more sense.
What I think is a given is the introduction of Thunderbolt on an iPad. The transfer rates would allow you to fill an iPad in under a minute, making sync'ing a breeze. It will be interesting to see whether it uses the dock connector or have a mini display port/thunderbolt port on board. Also, the 'one more thing' might be the ability to drive an HDMI or even HDCP TV from the Thunderbolt port.
There will either be a release of iOS 4.3 or 5.0 with the event as well. I suspect the former - it's likely that an iOS 5 release will tie in with the iPhone 5 in a May 5th presentation ("high five") later this year.
Given that the MacBook Pro with Thunderbolt came our without too much hoo-hah from Apple (despite being a big leap for the future) expect some of it to come out in the presentation. It wouldn't surprise ms if we saw a demo of a 64G iPad2 "factory wiped" and then connected up to a new MacBook Pro and restored in minutes, just to demo the speed in ways the average punter can understand.
Will I get one? Probably not until I get a MacBook Pro. But my willpower may be dramatically reduced when they come out, particularly if it has retina display on board ...