Who is Patchy?

Gregg Nations, Script Supervisor for Lost, answered a question on The Fuselage about whether "Patchy" from last week's preview was Radinsky (formerly Kelvin's partner in the Hatch). Here's what he said:

Radzinsky is in the previews? Uh, no. We haven't seen Radzinsky because he's dead. We could only see him in a flashback. So you're a little off with that guess.

So that means "Patchy" is someone who is alive, right? Guess we'll see tonight.