The guy who actually leaked the screenshot has removed them...seems like his dad is in shit load of crap...

)
I think, maybe, he is the one in the crap!
If you trace the origin of the post, you will find that he has been thrown out of the forum where he originally posted - lol.
"Well Arstechnica has also confirmed it..so I dont think its fake"
I think they rather commented than confirmed, I guess it is a matter of perception. They are also using a term, now running wild on the web "Escrow". This would not, axiomatically, be a RC as it should, by definition, include the source code. Certainly an "escrow " could be on the cards, but not as an RC to the public.
" it's very tempting to try out what's new on certain builds... "
This has been discussed before. Builds are not sent (or leaked!) sequentially. They are sent out, randomly, by Microsoft, to individuals, such as hardware producers or program writers (particularly driver writers), for the purpose of checking, among other things, if "bugs" have been rectified. Leaked builds may have old bugs and features in them.