Microsoft isn’t sharing specifics, but according to new information on its Professional Developers Conference (PDC) blog, the company is definitely planning to distribute in late October a pre-beta build of Windows 7 to attendees.

I’m assuming this build will not be the same one (the “M3″ build 6780) that leaked over the past week. The reason? Microsoft just added a bunch of new Windows 7 sessions to the PDC agenda that are focused on new user interface elements that are not part of the 6870 build I saw last week.