One thing about the SIW tool right from the start is that is for every version of Windows from 95 up being on a wide platform base there. I've found one item in XP, Vista, and now 7 that saw a misreport. It's quite thorough when matched up against other programs.
The main difference besides the new installer now seen is the utility there is a stand alone tool that provides a full breakdown on everything not just which version of Windows or expiration date is shown. When first seeing that screen right off it matches the one for the 7000s!
For the last 2 months you saw the 4/10/2009 date being mentioned quite a bit to see the 32bit 7077 seen several days ahead while ending up waiting for the 64bit on when? 4/1/2009 to appear. Now count how many days since the 7068 until then were seen. You should get the idea right off that it was just too soon for the next.
As far as the 7000 builds you won't see any expiration date just like as seen from the image there. The 7077 on the other hand sees the 6/1/2010 in plain sight! This is why keeping a close eye out for obvious "fakes" or some mishmesh is the first thing to consider when looking anything new.