Yeah I am very afraid of this Mission Control thing. I don't see the point in linear spaces, and I love using Alt + Arrows to navigate. I have 6 spaces, 1 for Photoshop, 1 for Pages, 1 for Instant Messaging, 1 for email, 1 for iTunes and App Store, and one for Safari and all that stuff. I don't ever have to minimize or close windows or even use Exposé much, as I can simply use the arrow keys to navigate between Apps. It's quick and easy as I know what is in which Space. For example, now I'm in my Safari Space, if I want to get to Skype, I just press Alt + Up as I know that it's right above.
I REALLY hope Apple does something, at least an option, to preserve this grid layout. I really love Spaces and I have never had a Mac before Leopard so for me it has become an integral part of the Mac experience for the past 3 years. I can't live without it, this is the one thing I definitely need. I can live without multi-touch, I can live without iPhoto, but not Spaces as I know it.
Also, as I've heard, in Lion, Spaces rearrange themselves automatically? What the hell? How will I know where a certain App is if it's random and changes all the time? I experimented ages to find the ideal way of organizing my Spaces, and now I should let an AI figure it out for me? What if I want a certain Space to be always accessible with the press of one button (and not the number keys!), even if it's not the Space I use the most often, as judged by the AI?
I want to be in control of my computer experience, and not let some algorithm decide for me. I actually enjoy organizing stuff the way I like.