I guess you mean F2Pool. P2Pool is basically decentralized pool mining where miners really solo mining but if they find the block they share coinbase with other miners in P2Pool, currently under 1% of found blocks.
F2Pool + AntPool is 46% in last 4 days. Why should they merge, any info for this?
I have not heard anything but I could have missed news. I would think they would stay separate F2 allows ether now.... so they are not just BTC. I just see F2 as a pool with more then BTC. And I don't see antpool moving into GPU mining support... so I don't think there will be a merge.
But eve if we hit 51 percent the community has shown in past with ghash they are willing to move and stop any chance at 51 percent atttack.