Google-Certified Ad Networks in AdSense

[SirKhan]

Hey guys,
Just received an e-mail from AdSense that they'll be adding other networks (!) to Google AdSense so that publishers will be able to "select" (it is done automatically of course) from a larger volume of ads to show the most relevant on their sites so that they can maximize earnings, check it out:

YouTube - Google-certified ad networks in AdSense

What do you think? Which networks could they be talking about?

edit: shoot I forgot to write a title, please my dear admins change the title of this topic thank you...

[SirKhan]

Update, just found this on DP, a guy has already a few Ad Networks on his AdSense account:
DataXu
Acxiom
Adchemy
Invite Media
Specific Media
Turn
[X+1] aka: Xplusone