As far as the second World Champion TNA promised at Lockdown (besides Lashley), they did say they would begin to "unlock the identity" of that person at last nights show. It looks like they were indeed teasing Taz. Before Samoa Joe came out to the Lockdown match, he was seen backstage speaking to someone getting what Mike Tenay called, last minute "instructions" for the match. Joe hit the ring and nailed a series of various suplexes - most of them being the signature suplexes of former ECW World Champion Taz.
Title changes coming out of last nights show saw Team 3D capturing the TNA World Tag Team Titles, Angelina Love capturing the TNA Knockouts Title and Mick Foley winning the TNA World Heavyweight Title.