Is RedPower out for Minecraft 1.4.6 Yet?

Yes.

[1.4.6] RedPower Core V2.0pr6

[1.4.6] RedPower Digital V2.0pr6

[1.4.6] RedPower Mechanical V2.0pr6

[1.4.6] RedPower Compat V2.0pr6

Download RedPower 2 Pre-Release 6 [Full Mirror]