0% fees and PPLNS earnings. (The tx fee is not paid out to miners for maintaining cost and the bonus for our engineers.)
This is not possible on the existing p2pool share chain. Every p2pool node would have to upgrade(?) to bitmains version.
It
would be possible for the 'p2p' pool as described by Bitmain,
for their share of the tx fees.
Miners mining on this pool are
not p2pool miners, and do not have to run bitcoind or p2pool itself.
They connect to a pool just like any other, except that in this case the
pool is a p2pool node.
The pool is the node, and would recieve the coinbase payout.
It would then pay the miners the portion of the 25BTC payout that Bitmain received, according to PPLNS, and keep the tx fees portion of the payout itself.