Apple has just released iOS 4.2.1 GM (gold master) for iPhone, iPod touch, and iPad (build 8C148) to developers.
iOS 4.2 GM was originally released a couple weeks ago leading to speculation that a general public release was coming soon. However, last Friday Apple instead released a second iOS 4.2 GM for iPad, and now with a 4.2.1 GM it's anyone's guess what the internal schedule looks like (or why the update servers are going up and down today!).
If you're a registered developer go grab it now. If you notice any changes, drop us a line or let us know in comments!