What's the difference between Eclipse 3.8 and 4.2?

Question

Possible Duplicate:
Eclipse 3.8 — what's the difference from 3.7?

I think Eclipse 3.8 and 4.2 both are Juno versions, but what are the basic difference in both? Why two versions of Eclipse Juno together?

Answer 1

Eclipse 4.x is using the e4 platform which has, for example, lots of UI changes. Eclipse 3.8 is mostly the same but using the version 3 of the platform.