The docs are up. Looks like Solaris Express program will now offer Solaris builds as beta releases from here out, and all naming is changing accordingly. Documentation can be found on docs.sun.com now(the password is in a text file with the ISOs on the Sun download page). The new additions since 02/04 (Build 51 or 52 depending on where you look) include numberous documentation changes and updates, the addition of Samba 3.0, several JumpStart improvments that are long overdue, changes to makecontext(3C), and Layered Driver Interfaces (LDI) which provides new levels of device driver observability. Also, some additional System V IPC resource controls have been added as well. Check out the Solaris 10 Beta 1 What’s New document for details.