Out of 51 retail games (this includes my Pandora's Tower pre-order), 20 are third party.
That means 39.2% third party. Not bad for a console with "no third party support"
Publisher breakdown
Nintendo 31
Sega 4
Activision 4
XSeed 3
Capcom 3
Ubisoft 3
Disney 1
Namco-Bandai 1
EA 1