Here's the official word, via VeloNews:
Vande Velde broke two ribs and a severe contusion and sprain to his mid-back, said Garmin team officials.... Officials said it was too early to speculate on how the crash might affect his preparations for the upcoming Tour de France. Broken ribs, however, are a complicated injury and depending on the severity of the injury, make breathing difficult and painful. Vande Velde also has a history of back problems.
Pretty hard to say how this will affect him for the Tour. I would guess he will be there, but whether he can peak for it is another matter. Sad news amidst an otherwise pretty crappy season for Team Garmin-Chipotle.