If this is a totally separate p2p like network but miners connect to Bitmain's servers only to mine on it, then they get the worst of all worlds: They get the increased work loss of frequent restarts, they get the high diff shares that will prevent them getting paid consistently unless they have very large hashrates, and there is no actual decentralisation since they'll be mining at a centralised pool created by bitmain that just happens to use the p2pool code for its backend but isn't really p2peer.
If all of the above is true, then bitmain has tried to cash in on the decentralisation concept by paying homage to the idea using p2pool without actually understanding it.
Fail.
I read it as they are offering both p2p for miners to run their own nodes, and "pools" that Bitmain manages. They say miners can now connect to their pools, and soon will be able to run p2p, and the code will be published within a week. If you check the hashrate distribution, antpool already has 5%, compared to p2pool's 2%, so if people switch over, that will get us to 7% to start. Just my assumptions and 2 cents.
Antpool supports solo mining and p2p mining, and p2p mining will be online this week as we stated in this announcement