This is not about piracy and not about leaks and not about…
I am waiting for the new RC build as you are. I am running an intermediate build between Beta and RC and would love to upgrade all my machines (including my MediaCenter) to RC. However, I refrain from downloading it from any of the untrusted sources. The reason for this is pretty simple: You never know (and it is illegal).
Years back (and I have told this story over and over again) we ran an event where we fixed PCs of consumers for free for a whole week. Pretty often, when we found an infected machine, we found P2P software on it. When we talked to the person owning the PC he/she usually told us the “my son/daughter installed that and uses it”. We know that P2P is one of the most dangerous source of malware.
Read now, what happens with Windows 7: Leaked Windows 7 RC torrents infected with trojan
So, rather wait until you get access to the RC of Windows 7 – and so do I