Today bbPress 1.0-alpha-3 was made available via the download page.
A couple of major improvements include new re-added support for “deep” integration and a new notification system that will report fatal errors in plugins on activation. BackPress is now also up to scratch with the code it borrows from WordPress 2.7, meaning a lot of bug fixes in those files.
I need those that are interested in the “deep” integration with WordPress to do some pretty hefty testing to ensure that it is robust enough to remain as a supported option. Keep in mind that some of the existing login and cookie integration issues remain.
Hackers out there should note that a lot of filenames have changed in the bb-includes directory.