Originally posted by: photonic
How in the FUCK do I know? You're so articulate. I know because I read what he said and hypothesized from the context. Sandaime recognizes Edo Tensei. When Orochimaru reveals his other technique, Sandaime is surprised(Episode 71). Therefore, it stands to reason, that the technique Orochimaru developed by himself and plans to use for Tsunade is the second one.
Or perhaps Oro did create the technique but had revealed it to the 3rd before, it isn't like that was their first confrontation. We may or may not see in the future but it is hard to say exactly what he is going to do at this point in time.