Here's the original thread of information:
http://warhammer.org.uk/phpBB/viewtopic ... 3&t=127740
A link to the comp rules:
https://dl.dropboxusercontent.com/u/882 ... 20v1.0.pdf
Army sizes were decided by a simple pool choice mechanic:
https://dl.dropboxusercontent.com/u/882 ... 20v1.0.pdf
And then they added some soft comps to summoning and shooting.
The TO's feedback:
After watching lots of games at Clash, and talking to people on their thoughts, I do think AoS can be played competitively. Just needs work.
I read that as: a comp pack is required for it to work as a tournament game, but it's doable.