Keep an eye on reddit as the festa approaches. I'm fairly sure people with no intention of going register just to get access to the timed exclusive unit, way too many people offered up tickets last festa as it got near saying "lol whoops can't go now" or some such.
Wouldn't be surprised if these units and up being Noctis 2.0. It was said that the event was coming to GL first, but they didn't indicate a lead time or anything. The great animation work makes me think they aren't far away at all for JP. These units are fairly weak to us, they'd be pretty much trash tier in JP though. With 7* being a thing, Barb could get some crazy additions too. That said, they're not exclusive to this event so we can pull em once it's over, if they do improve.