Alright she's installed (available on Apple Developer Program),
but I dunno how I feel about this one.
First point to note get ready to throw out your magic mouse, Lion pretty
much requires a touchpad to run all the new features. Using the touchpad
on the imac is a bit weird. I'm used to swiping back on the magic
mouse to scroll up but with the touchpad like the MBP you swipe
forward to scroll up. Actually takes some time to get used to!. You CAN
switch on the legacy mode on Lion to use your mouse but you going to miss
out on features.
My imac now mimics IOS, its a bit mental looking!

There are definitely 2 things I can see happening here.
a) OSX is morphing in IOS with heavy dependance on the App Store.
b) Without a shadow of a doubt, there is a touchscreen imac on the way.
I actually keeping touching the imac screen trying to launch apps!.