I thought on June 1st, they were just closing down Adsense accounts related to Adword arbitragers? Google recently put out a statement that adsense publishers must have quality landing pages as well as advertisers.
I've been going back and forth on this for a while and it appears to me that LPQ is only applicable IFF (if and only if) they drive traffic via ads. This tells me that if you are not using Adwords or any other legit advertising, you can still put up garbage. Things still need to be tightened down a bit. As for MFAs going away (I'm talking the poor quality trash sites) I don't see it happening yet.
The actual change to the policy says: So I think you are right, it only applies if you advertising your website.
3 ad units are plenty especially when using other ads. 1 to 2 ad units is plenty when using Adsense Ads.
Great news, I just hope people use them wisely and don't over do it. I have seen these ad units right next to their main navigation menu which is a good place to put it if you want to earn more and get more clicks, but it will also make your visitors go away straight away or it will confuse them.