Evans: if he is to win a GT, it has to be the Vuelta next year. Giro will probably have climbs that are too steep for him + Contador may be there.
I'd also like to see him try and win in the Ardennes again or San Sebastian or Lombardia. I don't think he is without chances in Flanders.
He should forget about the Tour completely as he will never win it, and he is unlikely even to podium.
I don't even know if they'll get invited. They did sign some good talen recently, so...
If they get an invite, he will ride the Tour.
Basso: I think he will go for the Tour and fail. He might try to save his season at the Vuelta. I doubt he will defend at the Giro.
Sammy Sanchez: Should try and win the Vuelta or the Giro. Skip the Tour. I have no clue what he/they will decide though.
Purito: same as those above + go for the Ardennes. But he will go for the Tour no question. Ardennes/Tour/Vuelta my prediction.
Menchov: I can only see him going for the Tour. He will want it, the sponsors will demand it. If he fails, which he probably will, there's always the Vuelta to fall back on.
Nibali: he should focus on the Giro. He might win it. Wait another year before going for the Tour. If he wins the Vuelta, I doubt it. There'll be no convincing him to sit out the Tour then.
Kreuziger - never.
Gesink - sole leader, might podium at Giro/Vuelta if he goes for it. I doubt it though, as he will ride the Tour.
Teejay - too early for him to deliver big bucks in a GT, maybe a top 10/stage win.
Same goes for Uran/Roche/Porte. I doubt Roche and Porte are podium material anyway.
J. Walker I really don't enough about.
Henao I'm excited to see in Europe. Huge potential there.
Sagan will/should go for classics G-W, RVV, FW all good for him IMO. Should also get a taste in a GT. Go for stages/experience
As for the Giro route, I have no idea.
I'd like to see the Stelvio again.
Cancellara and Boonen will go for the same races they always do.