I'm sure they'll rewrite it as a 64-bit executable and make a new dynarec.One of the biggest issues with PCSX2 as a core is that it's 32bit only, so you'll need a secondary 32bit RetroArch install if it ever gets libretroized. Unless you're actually using the 32bit version already, but it tends to have less cores available than the 64bit one.
Any day now...
We'll get an official Sony emulator on PC way before that