Ideally I'd want both old leopard exposé and mission control (without the bugs) in lion. I really do feel there's a place for both of them!
I hate to say it but... I like it.
I voted for the Mission control with spaces option (grid) (#4).
I wish I could assign different applications to different desktops as in Leopard/Snow Leopard.
I won't pass judgement on Mission Control until I use it. Currently I'm using the 10.5-style Expose in Snow Leopard: for me, 10.6's Expose was buggy, slow, and not as elegant. For 10.7, I doubt I'll be able to insert the older Dock.app like I am currently, so I'm hoping that the app-based window grouping will convince me of its usefulness.