[UPDATED]: Russia's T-50 has a sister, and she's about to fly

First flight of the second prototype of the PAK-FA stealth fighter is expected very soon after reports surfaced on spotter-boards of taxi tests completed today at the Russian test center in Komsomolsk-on-Amur. The T-50-2's maiden flight will follow the milestone event for T-50-1, which occurred on 29 January 2010.  If T-50-1 is manufacturer Sukhoi's aerodynamic testbed, T-50-2 is probably the guinea pig for the mission systems. Stay tuned for photos and video as soon as they're available. If you happen to be in eastern Siberia, point your camera at the sky. The T-50-2 just might be above your head right now!