"Leading edge" is fine. "Bleeding edge"... I'll pass! I prefer to sit back and let early adopters be the guinea pigs, discovering any bugs, incompatibilities, etc. By the time I upgrade, hopefully several updates will have been released and 3rd party apps will have caught up.
I can't think of any iDevice integration I need beyond what's already available in SL.
Not for me, just yet. If I were forced to buy a new one, it would be a 15" hi-res anti-glare, but I'm in no hurry. Mine still does all I need it to do.