Obviously the sample size isn't huge but interesting none the less. Keep in mind all the games are pros or very high level players competing for important WCS points and money/respect.
Terran is a little better in TvP with a 52.7% win-rate.
Protoss is slightly ahead in PvZ with a 51.3% win-rate.
TvZ is almost perfectly balanced in the WCS with Terrans holding a 50.3% win-rate.
For the very highest levels of play in SC2 the win rates are looking awesome! Obviously there are things that the game could improve on but I don't know how you could complain about these numbers. No race is even remotely close to dominating a MU.
Props to David Kim and the balance team this is impressive.