Beta 3.08 is out. See link for features of this and the past few betas. This new one is just a maintenance release. There's also a description of what to expect for Paint.NET 4.0 but that version is about 2 years away. There's also a sneak peek of the next major version which is 3.20. It'll require .NET 3.0. There's also a DDS export plugin in the forum among many other cool plugins:

http://www.getpaint.net/roadmap.html#v3_0