Probably, but the reality of it is this: KLP will drop at some point this year (I forget what the actual schedule is), then Nexus devices will get it. Then, for a long time, nothing will happen. A few new phones/tablets will get released with the new OS, but for the most part the forums will just fill with threads like "Verizon Sucks! Where's KLP?!?". Then, *MAYBE* a few months after that leaks will start to come out, making it possible for rooted users to upgrade, but angry non-rooted users will still flood the forums with questions no one can answer. Then, in early 2014, if Samsung does prepare a KLP for the S3, it will be released. Of course, the update will screw up more phones than it improves and the S3's older technology will cause it to lag under the newer OS, but hey! we got KLP!
Not trying to be cynical, but as I posted above, when you buy a phone, you should do so not expecting any more than 1 -- maybe 2 if you're lucky -- major upgrades. (Nexus line excluded). The technology moves to fast, and the R&D and QA process for new updates take too long to get through manufacturers and carriers for it happen any other way, given how things work currently.