Yes, but your additional zone will only be the HDMI feed from the HDMI output labeled "Zone 2". The HDMI feed zone does not require any additional channels from the receiver to function, but you will need to run it direct to another HDMI capable device. A receiver in another room or TV located in another room. The neat thing about using the HDMI as the feed to the zone is it will pass 7.1 signal I believe so if you run it into another receiver you can setup another surround system in another part of your home. Kinda cool.
Yamaha CX-A5000, ATI AT 2007 Amp (7X200W), ATI AT 2004 Amp (4X200W)Klipsch RF 63's - Main, RB 61's - Front heights, RC-62 - Center, RS-62's - Surround, RS-52's - Rear Surround, 2 Rythmik DS-1510 DIY Subwoofers (With PEQ600XLR3 Amp) each connected with Antimode 8033S-II, Oppo BDP-95, MMF-7.1, Project Phono Box RS, XBox 360, XBox One