So Calli gave us a timeframe for the overdue EN gen 1 outfits in her
chatting stream (1:24:17): "Not much longer." Also told us it comes with new facial expressions.
More importantly, nothing she said disproves the rrat that I believe which explains the wait: All the new outfits were nearly fully rigged, but then management looked at Gura's rigging, realized it was once again garbage, threw out all the work her rigger had done on the new outfit, and finally just told him to fuck off forever, never to taint another hololive idol's visage with his sub-par rigging skills ever again. Of course, that means they had to hire someone else to rig Gura's new outfit, and that's why they've been delayed.
okay I don't actually believe that but it would be really cool if the outfit didn't have holes in it this time