Federer has only won one French Open (in 2009), so a win there wasn't necessarily expected. Compare that to seven Wimbledon titles.
Federer is currently playing in the Gerry Weber open—his first grass-court tournament of the year. Although there have been cracks about his age (mostly because of his new haircut) recently, he doesn't appear to be slowing down.
Today, he advanced to the semifinals after recording a double bagel (two 6-0 sets) in 39 minutes against Mischa Zeverev—just the second of his career. Seeing as prior grass-court performance is obviously a better predictor of future grass-court performance than prior clay-court performance, Federer looks to be setting himself up nicely for Wimbledon:
Every time Federer loses nowadays, chatter about how his career is finished has been quick to follow. Greg Garber of ESPN.com mentioned in 2012 "the discussion of whether or not Federer and his cranky back would ever win another Grand Slam singles championship." But according to Jim White of The Telegraph, this sets the stage perfectly for Federer to bounce back and silence the doubters.
And after all, Federer is the defending champion of Wimbledon. Fellow great Andy Murray is also notably dominant on grass, but he is just getting back on his feet after missing the French Open due to injury. It will be interesting to see how Murray does against Tsonga in their semifinal match in the AEGON Championships tomorrow. But if we're solely looking at Federer and Murray head-to-head at Wimbledon, we don't have to look past last year.