I have updated
p2pool.io to use jtoomim's 1mb_segwit fork.
p2pool.io:9332 is still based on Bitcoin core.
I have also deployed
ltc.p2pool.io:9327 for Litecoin mining using the same fork and have plans to add several more coins very soon.
has been moved back to forrestv's p2pool/p2pool@master branch. (The original P2Pool)