From Camel of DroidMod:
Another OTA update has appeared, and this time it?s packing a punch. Upon initial inspection, it appears that they?ve closed the sbf root method by including a new version of mbm, presumably using a different key to sign sbf files. No one has actually verified this yet, but we don?t see any other reason for why an mbm update would be included, and we?ve had suspicions for a while now.
If that is indeed the "real" "update" then its FARRR more than just a "root killer"