As we all know, the Trek XI Enterprise is a different ship from the TOS enterprise. They’re hints the Nero-created timeline is responsible. Now the question that won’t likely be answered until we see the movie in May is, did Starfleet simply speed up their R&D after Nero destroyed the Kevlin that otherwise would have been done post-TMP, or did future technology come into the hands of starfleet that enabled than to make a more advanced ship? Heck, maybe time traveling Spock pulled an Admiral Janeway. The nuTrek Enteprise probably has enhaned weapons and shields, maybe even an enhaned warp drive?