There will probably be a few revs before 4G (which based on 3G/HSDPA usage would mean wireless 4G/LTE usage), as it will take years to get reasonable deployment for those.
There will probably be a spike to 32GB when Apple switches to the 16GB flash chips.
Video is software, not hardware, and there are technical reasons (no focus) that we may see 2mp stay for the camera for a while. Better battery, 802.11n WiFi, higher screen res (640x480), and other internal tweaks are probably more likely short-term than 4G.
A funny thing: there was a 4G iPhone ad in my local Craig's List. It was the original iPhone and probably on accident, but I chuckled.
I'd like to see them make what they have better, not necessarily new features. Longer battery, better gps apps, faster 3g,
Oh and better apps. Aside from a few games and streaming apps, apple's control over them is old and could get me to switch to another later. Slingbox comes to mind, tethering app, etc. It's getting pathetic having to sort through all the trash apps to find maybe 4-5 decent ones.
What apple has going for them is what they need to keep in mind. The whole experience of the touch screen, how easy it is to navigate, screen res, great kb, browser, etc.
Keep in mind as well, some say opera on the touch diamond is a better web experience than the iphone 3g. If that Diamond responds well to touch, isn't too sluggish, and can be used to type with well, ..well let's just say apple has work to do. Even so, the touch pro could alleviate that kb concern. But in the end, i can tweak the diamond, run the apps i really want, not to mention be on a much faster, cheaper network.
I'd bet my life savings (not much) that this will never happen10.I would hopefully expect to find a slide out keyboard (PLEASE APPLE)
Bad Ash: Link for the iPhone slate on Gizmodo, if possible.
Also, I would not like this phone as much if it had a slide out keyboard. Soft keyboard is amazing, in my view. Whatever happened with projected keyboards (don't know the real term for this)? Keyboards that are projected onto any surface and you can type on like a standard keyboard. I saw them and those a while back, but nothing recently. I would like to see that, even though it's pretty impractical for a cell phone.
Here is the link you are looking for. Has the gizmodo link in it.
iPhone HD Speculation Increasing? | The iPhone Blog
I'd bet my life savings (not much) that this will never happen
HD makes sense given Apple's current movement and the competitive landscape...