Our VW store has been on it for almost a year now. I am assuming GM is going to follow similar guidelines with pricing being tied to Co-op funds, compliance reviews etc. Its kind of a pain but if you can setup your IMS with some lifecycles/buckets/etc.(whatever your tool uses) based on trim level it makes life a lot easier. You just update your lifecycles once a month when the incentives come out. Put all your cars at MSRP on 3rd parties and submit for compliance often.
It's kind of a good thing really because then everyone has an advertising floor. No more $13,000 jettas.