Well this is what i think that they will do:
I think we can all safely assume that the new ultra-portable will have intergrated graphics and a relatively small storage well then i think that the dock will inc. a
Large display at least 20"
a bigger harddrive
a good graphics card (configurable)
an optical drive
isight and keyboard and mouse
and the the range of ports
also havent we all heard about these rediculosly small processors intel's releasing, then the new ultra-portability can have a really gd processor, but compromise on graphics until u slot it in the mac-shell where it then uses the graphics card in there. Also i think we should all stop worry about overheating since this is apple were talking about and they have pro industrial designers who will work something out.
If the above is true, i would snap one up straight away!!!!!