yet you dont see much about that either, hmmm interesting dont you just love the STO teams transparent mirror
My tip. Read the Dev Tracker regularly. They don't always make public announcements on this, but Cryptic tends to be relatively open on this. dstahl mentioned that QA had discovered a problem with the latest build (which apparantly not just includes the Nebula but also some game balance tweaks) and it might be delayed to early next week.
As a Klingon, I have destroyed at least three Nebulas in the D'Kal Star cluster exploration area. The sprite is in the game. It did not describe the type of ship it is. It registed as "Federation Nebula Class".