Details are trickling out on what goodies the pre-beta build of Windows 7 will contain, courtesy of ZDNet of course. A new animation framework is among the additions.

Microsoft isn’t going to show Windows 7 to attendees of the Professional Developers Conference (PDC) in Los Angeles until Tuesday, October 28. But new info about what’s part of the pre-beta build that will be provided to show-goers is beginning to trickle out.

According to a variety of sources, the build that will be distributed at PDC — and, a week-plus later, at the company’s Windows Hardware Engineering Conference (WinHEC) — will be one of the M3 (Milestone 3) builds. Like the build that leaked in September, this will be a 6801 numbered build, sources say. But it doesn’t seem to be the same one I saw a few weeks back. UX Evangelist blogger Stephen Chapman says it will likely be a 6801 M3 build which Microsoft finalized on October 20.

So what’s in this soon-to-be-delivered Windows 7 pre-beta build? Here are a few new features Microsoft will provide, according to various individuals who’ve had a chance to see and hear about the forthcoming PDC pre-beta build. (Note: I didn’t bother running this list by Microsoft for official comment, as I figure the response will be: Wait till Tuesday.)