They're in the works. Assets have been finished for almost a year now, the main thing left is voice acting, but that'll take some time.
They were originally planned to release sooner but the engine upgrade slowed things down to a holt.
They could come with EI drop 2, but I doubt it.
Assets haven't been finalized, not at all. We're still working on them. Voice acting is a big thing too, but we have held off on further development to finish EI part 2. Women characters will come ideally in the next major update after EI is finished.