Makeb planetary stroy should not have anything do to with TDM (the original leaked plot was that Hutts served TDM and they made them capture Makeb, or something like that, but now it looks that Hutts just decided to do it from their own free will)
Actually the original leak had to do with a new daily Area and Operation.
The new Area was called "Varl" the Hutt homeplanet and the new Operation was called "Scum & Villainy." The Operation had them amassing an army on Varl which would aid them and their new allies... the Dread Masters.
A 2nd planet was datamined after this leak that involved the Hutts taking over, but there was no mention of the DMs for that one (it was probably the previous name for Makeb).