Alrighty so the main differences in v4.2 will be that the SPHA-T has been removed due to questions surrouding the legality of the model, and has been replaced with the original Rebel MPTL Artillery.
Most importantly though is the introduction of Phase 2 Clones. Now if you install the mod as per usual, you'll get Phase 1 Clones - what I've done is added two extra folders into the XML folder, and you'll have to copy and paste the files in one of these two folders into the main XML folder in order to get Phase 2 Clones.
Option 1 directly replaced Phase 1 Clones with Phase 2 - every Clone at every stage of the game will be Pgase 2. Note however that Clone Commandoes and ARC Troopers, plus the hero Beta will always look the same.
Option 2 makes it so that the Republic begins with Phase 1 Clones, and then when the Republic reaches tech level 3, they become Phase 2 Clones. As before, Commandoes, ARC Troopers and Beta remain the same.
v4.2 is now available to download right now here at Moddb.