You heard it here first. Heres the info I have so far:
No exact release date yet but look for it around July. Sony had originally planned to make it a holiday release with new content. But they couldn't create the content they wanted so the release date got pushed up.
It will be a BD50 with the following specs:
Audio: 16bit PCM and TrueHD (either 20bit or 24bit, not confirmed yet)
An exchange program is still planned for current owners.