Do people still support this thing? I thought it was clear now that the changes proposed in Bitcoin XT would centralize nodes to a ridiculous unnecessary level. It has been tested that 2 MB is the best we can do for now, 8 is just nonsense, not to mention Hearn's involvement in R3 and all the anti-Tor stuff.
Bitcoin Unlimited is a fork from Core. The similarity it shares with XT is just that it too sets the version bits in the block headers to vote for BIP101. However, BU nodes will accept blocks > 1 MB
today; while XT nodes won't accept blocks > 1 MB until 2 weeks after 750 of the last 1000 blocks vote for BIP101.