Well, you have to hand it to Microsoft – they stick to their plans… Although the bits have been available through torrents for a week already, they just released them on TechNet and Connect (and I assume MSDN as well).
Downloading… 🙂
At the moment writing up a guide on how to install a clean version of the RC (or the RTM when that time comes) and keep your settings and data. This will be posted on May 5th – when the RC is released to the general public.