My understanding of the April date... it's not a release, but rather an announcement by Microsoft at the MobileCongressSomething (April 1-3) that Windows Mobile 6.1 actually exists. Surprisingly even though everyone already knows about it, Microsoft has NEVER talked about it... so April 1st will be the announcement probably announcing a future date for the available update.

And I am hoping it's a Windows Update and not a service provider download... or we are all out of luck.