PS2 is not dead yet apparently so it was a right decision to keep my ps2 around ^^. NIS America announced that Ar Tonelico 2 will be out this December for ps2. Having just recently played Ar Tonelico: Melody of Elemia back in June, this is a really good news for me because I was worried that NIS America may not release it due to decreasing popularity of ps2.
The battle system is similar to the first one with a new ability called Syncrinity. You are still required to dive in Cosmosphere for your Reyvatails to make them more powerful and get new songs. Syncrinity ties to two Reyvatails in the party so the closer their emotion being synched up, the strong their song magics are.
Check below youtube video for Synchronization.