WP7 team said : http://windowsteamblog.com/windows_phone/b/wpdev/archive/2011/02/14/building-the-next-great-mobile-software-developer-opportunity.aspx
Nokia, and now Microsoft, are committed to making sure that your contributions to and investments in the Nokia ecosystem will be worthwhile. In the coming weeks we will provide more information about programs that will help you access the Symbian and Qt opportunities more effectively.
So how many weeks the 'coming weeks' are ??
and, there is something only the vc team could talk about, since VC2010 comes with no 'smart device' support, WEC7 uses VS2008 as the development tool, on the other hand Windows itself is going ARM, so here is a questin: will VC11 support ARM ? if no, then we can forget Qt for WP7, if yes, thats something to begin with, and then, the next question goes to the WP team.
my personal guessing would be: Native for WP7 ? possibly(1). Qt for WP7 ? very unlikely.
but as long as you can compile C++ to WP7, you can always leverage those non-ui part of Qt as your libraries.
(1) as Diegum said: http://blogs.msdn.com/b/vcblog/archive/2011/02/24/10133517.aspx
A few days ago I compiled all these claims for native support in WP7 and send that for the wp7 team. Not sure if, as your advocate, I'm to win the case but I keep my bets high. I'm confident that the same will start happening with other techs as well (xna, etc)