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Has anyone heard of anything happening for the Templars? Like a new codex and such.

have you checked dakka or warseer? they're both usually quick with info about GW.

There's nothing concrete. Talk for new books in the near future has included:

CSM (possibly some distinction between original legionairres and current chapter traitors, cultists)
Dark Angels (rumored new plasma pred, this might have been wishful thinking)
Tau (again, poss. wishful thinking)
talk of more flyer waves

so, probably nothing for at least 6-8months, and they tend to not clump pwr armor releases too much, so probably looking at longer, though they are one of the oldest marine codecies

rumor also has it the new box set is CSM & DA.. that would make both of those codexes out at the same time.