Here's my theory on the "new and improved M2 Pro cam" and its higher speeds.... the '08 Cheetah and Bengal models WERE ADVERTISED to be 315-320 IBO capable... one problem with that claim - THEY AREN'T!!! I have done a lot of chrony testing with my '08 Cheetah and I've read plenty of posts on here from other Cheetah and Bengal shooters. Neither myself or any of the other shooters are posting speeds that are consistent with a 315-320 IBO rating! So, the new M2 Pro cam likely IS faster and is now actually capable of reaching the advertised speeds.
I believe that Martin is basically admitting that that their old IBO numbers were inflated by saying that the new cam is faster yet giving it the exact same specs as the '08 bows. Just my conspiracy theory.