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2 months will be a little longer of a span but it just means that update will probably see the last of the gen 1 in and have coding ready for the start of new gen 2+ stuffs.
This is all just guessing though.
All I'm saying is update when pixelmon updates. There will be another pixelmon update ready for 1.6 of minecraft.
Edit: I didn't phrase that well. MultiMC won't let you have pixelmon on 1.6 until pixelmon and forge update for 1.6.