https://twitter.com/omgubuntu/status/563695896614170624

Canonical have apparently confirmed that a Meizu MX4 (not sure if vanilla or Pro) with Ubuntu Phone will be launched at MWC and available internationally.

I'm assuming all Ubuntu Phones will be rootable, given the nature of Linux ... hopefully that also means unlocked bootloader is either a given or achievable. If so, hopefully we'll see Sailfish on the MX4 quickly.