Supercharger Types + Release Date

I know the question concerning the release date has already been answered in a topic, but I'm looking for a more accurate wait time/date of when superchargers will be re-released (I read on YouTube that they were in, and then taken out). If the wait time is too long, is it possible I can get the older version that did have superchargers (if that exists)?
As for the types of superchargers, what should I expect? Twin Screw? Centrifugal? I plan on supercharging my 4.8L Vortec LR4 sometime soon (and I've got the engine spot on accurate in game), twin screw of course!
As for the types of superchargers, what should I expect? Twin Screw? Centrifugal? I plan on supercharging my 4.8L Vortec LR4 sometime soon (and I've got the engine spot on accurate in game), twin screw of course!
