Correct all NXT holders can claim 10% in PEX Coins. So if you were holding 10,000 NXT at the time of the fork you now also have 1,000 PEX.

The proof of stake consensus works a little different than most. We like to consider what most would call a masternode a public facing node. The setup is similar to a masternode and functions very similar however is not a masternode. Holders of PEX will be forging / staking their balance to verify, host, and store the entire blockchain on their server. (the entire chain is very small less than 100mb). Having more trusted public facing nodes will allow the PEX coin to never be taken down and becomes a distributed decentralized blockchain. However we need others to create a public facing node and start forging to help grow our exiting network. In turn will also increase transaction confirmations and time it takes to communicate between nodes or peers. All PoS rewards are generated from transaction fees on the network. It will cost a flat fee of 1 PEX to send any amount. These rewards are distributed to forgers / stakers of PEX.

I hope that explains things a little more.