Reposting my comment from their reddit thread here.. it makes me chuckle:

I just attempted to load a bitcoin2x node compiled from their github codebase (knowing that it hasn't officially forked yet, but getting a head start), and though the node hasn't fully synced yet (300,000/500,000 blocks) I attempted to create a segwit address on the 'segwit2x' chain, which is essentially bitcoin core 0.15.1 with a new algorithm, expecting it to work without a problem.

Unfortunately, I get this error:
$ bitcoin2x-cli addwitnessaddress 1Ap4Qq6tnAdMEcL2LSNQFxxxxxxxxxx
error code: -4
error message: Segregated witness not enabled on network


If the 'segwit2x' guys haven't bothered to actually update their github to enable segwit, the day of the hard fork, that's moderately hilarious.

At least it gives people somewhere to point their X11 miners at since there are an literal plethora of them out there that need a distraction from the miserable returns they've been getting lately.