Can anyone tell me if some of the original colors will be available like Purple, yellow and green?

 

None so far.
There are plans for a R/T Classic edition and SRT8 Spring Special.
That is supposed to be out in early 2009.
Both in B5 blue.

But the closest you could get is buying a 06-09 Super Bee or Daytona Charger.
Those are offered in blue, yellow, green, and purple, among other colors.
That's all I know of right now.