Glad to see everyone is as excited about the Omega2 Pro as we are! :D
A few clarifying points:
The Omega2 Pro is an addition to the Onion family. We will not be discontinuing Omega2 and Omega2+ for the foreseeable future.
The firmware is an Onion-flavored OpenWRT 18.06. We will still continue to create firmware for the Omega2 family, and the OpenWRT 18.06 version will make its way to the Omega2 and Omega2+ in the short term.