Reading around the usual 6 AP2.5 titles got another round of AP2.5 challenges and will need to be reburned with new patches as and when they appear. (I assume we all know the list by now but Assassin's Creed - Brotherhood, Need For Speed - Hot Pursuit, Fable III, Call Of Duty - Modern Warfare 2, Call Of Duty - Black Ops and Halo Reach).
Other things a bit up in the air with regards to reflashing (13146 to this should be safe but others) and some are even calling flagging. I am waiting for the dust to settle before paying any real attention to anything though.