Here is a nice article on the latest info for SAMBA 4 (that I have found). It's from the Linux.conf.au in January about a conference with Andrew Tridge.
In particular, this was my favorite part:
In particular, this was my favorite part:
Microsoft has introduced a new protocol - SMB2 - with the latest Vista technology preview, and the boys on the Samba team are having more fun than they've had since the 90's reverse-engineering it (it's just network protocol analysis - nothing illegal), and they have released their implementation, in Samba 4 technology preview, before Microsoft. Booyakasha!