I think you'll find that until Wm 2005 comes out in August very few new PDA's will be out before then. Of those so far we know that the MDA III is the only will be coming out.
www.pocketpcthoughts.com is a good place but they wont post any information about WM 2005 until it's released due to NDA's otherwise here's pretty cool or Brighthand if you can't be bothered and don't the fact that any little bit of information get's reposted for about three weeks.