I would love for anyone outside of the big 4 to win. Preferably a younger guy.
Jerzy perhaps? ...I know Gulbis is playing well, but he is not playing well on grass, too dependent on his serve, not enough time to execute the FH. He will probably get a scalp, hopefully two. Raonic with all his big game and serve is not great on grass either. But that is all very unlikely.
From the big 4, I think Djokovic has the best game right now. It would take a very good Draw for Federer to win, and even then, he would have to go through 2 of the big 4 to win it. Rafa will get knocked out early by a big hitter. Lately, quite a few guys almost did it, grass will provide a good platform for one of the big hitters to get over the hump me thinks. Rosol is not Soderling. Murray may get to the finals, but he just cannot win a good Rafa or Djoker, he would love Fed in finals at this point.
Ferrer has zero chances to me, Haas as well. Ferrer just can't win any of the big 4 - so no title for him. Haas is too old, won't last mentally or physically, although he can have a nice run with decent draw. Waw can't play on grass, so he is out. Berdman will get Gulbis in 2-3rd round....Tsonga doesn't like winning big titles, Gasquet proved many times he ain't no winner. Delpo seems to break down before getting SF nowadays...