Or people could just wait till the 5th if they don't have a technet or MSDN subscription.
The humanity, having to wait for like 5 whole days :O
The build 7100 has been available from "unofficial sources" for quite a sometime already, it came week or two earlier than to MSDN / Technet.
Though while the build is the same, there IS differences between these, the leaked one has earlier expiration date 2nd of March 2010, opposed to.. sometime in June I think of the official one, and this doesn't include the "XP Mode" aka new VirtualPC