According to @evleaks, Google is targeting to launch the first Developer Preview of Android P later this month. Considering we got the first Developer Preview of Oreo back in March of last year, and if Google sticks to this timing scheme, then mid-March makes complete sense.
Not only are we thinking mid-March sounds solid, but if Google was concerned about being even more Googly, March 14 would be a fun date. As you may know, March 14 is known as Pi day (3.14), and we all know how much Google loves Pi.
Android Pie, anyone? You never know!
So, if you own a Pixel or Nexus device, you may want to get prepared.