It's funny you say that as this year a cavalcade of top tier mobile games have been pouring into WP8 thanks to the update to Windows kernel.
Just today alone: Tiger Woods Golf,
Mass Effect,
NBA Jam, and
Real Racing 2 were released for Windows Phone 8.
Gameloft has been releasing 12 games in the first half of the year. All Rovio games are being released suddenly and Angry Birds updates are coming out day and date. The Temple Run series has started hitting as well thanks to the porting of Unity to WP8.
Top tier mobile apps and updates are pouring onto the phone this year as well thanks to the Windows 8 kernel and Microsoft's developer muscle. Microsoft isn't chasing volume on phone they are chasing brand names right now like Pandora, Tumblr, Instagram. Same seems to be true for Xbox.
Does a normal person care about Jon Blow's next game? If it was Braid 2 it would be one thing. If MS wants a popular game they will get it.