I'm just out in Fargo at the moment meeting all the GP people based out here and I'm getting some really good info from all of them, both about upcoming GP developments, version 10 planning and where we are going beyond that.
One of the most difficult things that I've found since joining Microsoft is trying to find out where all the useful information is as there is so much of it! The GP team in the US pointed me to the Microsoft GP Assitance Center (http://mbs.microsoft.com/public/gponline). This site has got everything you need to know about GP 9.0 on it including implementation and upgrade guides, user documentation, white papers and developement resources. If you need to know anthing about GP 9.0 this is the place to go!