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Phillip V said:
Will this be compatible with 1.3?

I would say most likely not, but i am not involved with the production so i cant say for sure. 1.3 will probably change too much to be able to use the same core version in 1.2 and 1.3.
 
So far there have been reassurances from the team that say that 1.3 will not affect CORE.