For those of you who live near Seattle or are planning on attending PAX 2010, you'll be glad to know Microsoft's Xbox LIVE and Windows Phone 7 will be present, at least according to Mike Klucher (Lead Program Manger - XNA Development Platform at Microsoft).
The popular gaming convention runs September 3rd-5th at the Washington State Convention Center and should be a lot of fun. Registration is $35 per day or $55 for all 3-days, but alas, only Sunday is left open for a badge. At this time, there doesn't appear to be a specific panel discussion of WP7 and XBLA, but we'll keep an eye out.
Regardless, we an expect some more hands-on and gaming footage in less than two-weeks time, which sounds good to us.