The Online Playtesting Agreement (http://www.wizards.com/dnd/files/DNDNextPlaytestingAgreement.pdf) may prohibit excerpting the rules as is common practice on rpg.se:
You agree not to copy, excerpt, distribute (either in physical or digital format), publish, display, disseminate, release and/or transmit, in whole or in part, or create derivative materials from any Playtest Materials provided to you... Notwithstanding the foregoing, you may publicly discuss your thoughts regarding the D&D Next Playtest Materials and your playtesting experience.
I'm not a lawyer, but my reading of this is that we are free to discuss the materials, but not excerpt them here. I would love to be wrong about this, if anyone who is a lawyer and/or has more explicit information from WotC could chime in.