An unknown Lumia Windows Phone has quietly appeared on Nokia’s servers via Navifirm, suggesting one of those big rumored devices is being tested behind closed doors. Could be that true PureView device for AT&T we’ve heard so much about? Or Verizon’s iteration of the Lumia 920? Or maybe something else entirely?

Known as RM-860, there’s really nothing to take away from this discovery other than there’s a new Lumia device on the way. There’s no mention of carrier or specs—nothing. But an unknown Lumia handset is being tested, and that in of itself is exciting news.

Nokia has scheduled a press event for Feb. 25 at Mobile World Congress, so the timing is coming together quite nicely. I’m sure it’ll only be a matter of time before pictures and even more information leaks out.