Original source
http://www.g-heaven.net/topics/2013/11/131128a.html
English summary (relevant portion at the bottom)
http://bumped.org/psublog/a-very-mer...mas-from-pso2/
Yoshida and the PSO2 devs discuss a collaboration but its neither yes, no or maybe.
I loved PSO and enjoyed PSU, but I am not fond of PSO2.
What I'd want: Dragon, Dark Falz and De Rol Le FATEs with mag pets or classic PSO weapons as a reward. (The initial quest being given by an Elezen dressed like Jean-Carlo Motague... oh yes :3 )
What would likely happen:
PSO2 thus far disregards the lore of the original PSO and the lore of the franchises they collaborate with so I imagine on their side they'll just throw in an AC gacha with FFXIV themed costumes and mag skins and leave it at that.
For FFXIV, it would probably be similar to the Lightning event with Quna appearing out of the blue to kill darkers and we'd get a tacky default one piece Hunter costume.
