Other than being split between a CD and DVD version what other changes are there in the base system and knoppix tools (not just added apps) since 3.9? I am curious because I have just spent quite a bit of time moving my knoppix based distro to 3.9 and need to know if it will be worth it to move to 4.0 or whether I should just wait for 4.1 or 4.2.