Good question.

My main plan is to get up to date with all the development in bitcoin-core in the coming months. The version of Bitcoin used internally, that is.

IF I won't have the time to update everything and IF it seems as if XT will be on the winning side, I will apply the specific larger block patch from XT separately, well in time for it to be available in a Credits release before the larger blocks may start to appear (late january 2016).

In short, it should not be a problem. At least not more than it is a problem for Bitcoin.