In a story from Variety it looks like NBC and Warner Bros. are eyeing a series order for John Wells Police.

In addition to this, it looks like there will also be an episodic extension of ER.

While the fate of Police is still up in the air (as far as where it might end up), there was originally talk of merging ER and Police as the formers show closes out.

Apparently, ER's final run is being extended, as Police debuts with 6 episodes.