Like most Ax developers I am looking forward to the Ax 2012 release in Q4 this year (in the US a bit earlier). Today Microsoft launched the Ax 2012 Béta and I can’t wait to try it. You can find the download on partner source (Hyper-V & ISO) and customer source (Hyper-V & ISO). Keep in mind that you need a valid PartnerSource and CustomerSource-account.
Extra info is available on TechNet.