The U of Rochester team points out that
a) though it worked for Italian speakers, where the way a word is written closely matches its sound, the results may not transfer to languages like Chinese or English
b) there are many potential causes of dyslexia, and those for whom attention issues are not primary may not benefit
c) reading comprehension was not tested (darn) and it not necessarily correlated with reading speed.
Spoil sports, that's what I say. It looks like an awesome game, and if I had a dyslexic kid (and could afford it) I'd run out and get a Wii right now and set them loose. I might even play a few rounds myself, those bunnies look fearsome cute.
Bavelier "dispatch" linked below. Franceschini paper here.