As all project managers know, a fixed scope and a fixed release date are often incompatible. You end up either cutting or half-implementing features to meet a deadline, or you end up delivering the full product late.
This, as it turns out, is also the case for TR1803, our planned and announced as-such March release.
It is obvious right now that the deadline we set ourselves is not possible to keep. As such, we are releasing it when our content criteria are met, which, at the time of this update, should still be in Spring 2018.