And the next one will probably continue that "trend".
The second iPhone was called 3G because it supported 3G, so they couldn't name the third iPhone the iPhone 3 since that sounds older than 3G.
I believe that they will call them iPhone 5, 6, 7 and so on - still with nothing more than iPhone printed on the phone itself, just as a MacBook is a MacBook.
Spaces are Spaces.
In Mission Control it says Desktop 1, Desktop 2 and so on, when it's the actual Desktop it contains.
Other spaces might have full screen apps and Dashboard.
I think it makes sense just as Wi-Fi is much better than AirPort, since not every Mac user is connected to an AirPort base station.
AirPort is the hardware product name and Wi-Fi is the name of the technology.
It's removable in DP2.Holding down Option is enough in some cases. Which means that it's the same as in Dashboard.But only in some cases. The Lion Installer app show an X when holding down the Option key, but my LogMeIn Uninstaller required Control+Option+Command+Clicking - no X was shown. Default Mac OS X apps can't be removed.I think it's still a work in progress.