Its not like they are asking the people on the forums to design the damn thing. If you want to participate, you need to sign up for the play-test. You can't in good faith expect that WotC reads every single post on every single board around the net.
As for that, with exposure on CNN, Forbes, NYTimes and a gazillion of other places, as well as ENworld, etc, it's pretty safe to say, that if you hang out on the interwebs and dig RPG's, there is a really good chance that you have seen the announcement and had the opportunity to swing by and sign up.