Hedfix said:This is good news. About time the WP8 exclusives ended, there must be a bigger userbase on WP7 anyway so in theory they should make more money by covering both.
This.
I guess they're trying to entice people to move to WP8 but you really need a larger library of games for WP7 users to move. Anyway smart move, it also opens up more options to play with other people across all the platforms.