Well NiGHTS 2, Rygar, SC Legends, Boogie, Manhunt 2, a EA/Spielberg exclusive, Oponi, Dewy, Zak & Wiki, etc. have all come to light during the past few months and we're not even at E3 yet.
The whole "you need all the third parties to have success!!" thing is so overblown anyway. Positive mindshare + 1 or 2 system moving killer apps + a reasonable steady flow of content are more important than having what some 30-year-old hardcore gamer on the internet thinks is a good lineup in a list wars debate.