I can tell you what will be the change in WD, the pets will become stronger and more efficient, probably with lower cooldowns fulstop.
Pets will probably scale with int/vit/resists, but given that their legendary has a reduce CD for the pets on it (of like 18 seconds if memory serves), it's unlikely that the pet CD will be reduced. Problem is, you can buff the pets all you want; they are still useless as their damage output simply isn't meaningful.
Odd the lack of mention of Gargantuan. I assume he's getting the same changes as the dogs?