Building upon v4.2, v4.3 includes both patches as well as new sounds for the Republic Dreadnought and both normal and Super Battledroids.
There haven't been a whole lot of changes, mostly because I've used what resources I have and there isn't much more, if any, content to be added to the game. This may be the final installment of RotC, then again it may not be, it all depends on if any new resources become available for me to use.