He already said it. The new game is a response of Bardie's ban.
What I'm asking myself is if the new game will became his main game soon, because of the great reception that it's getting: it already has 700 patrons. Although, DM isn't the writer of that game, so I think his preference for Fashion Business will remain until its end.
Personally, I think all that story about a team working on a new game is just Decent Monkey's ruse. Maybe he is paying some guy to write the story for MILFs of Sunville, probably not. Of course, Decent Monkey couldn't publically say, "Sorry, guys, I'm opening a second Patreon account because I want more money, so new updates are going to be smaller and less frequent, but you have to pay me the same amount every month."
I don't know about you, guys, but everything about that new game screams of Decent Monkey - the pictures, how the Patreon account is organized (with all those horrible extra versions), the design of girls, the interface... Every fucking thing.
My guess is that Decent Monkey was scared of being banned from Patreon and at the same time wanted to make more money (all those Steam efforts prove it). He created a completely new account and is developing a new game. It is very comfortable for him - it is better to have 2 accounts because this way he can make more money, and he is hiding behind some "team" so there would be no outrage among his patrons.
More than that I think that all that story about his sickness was also a lie. Considering the time when he was "sick" (about the same time when someone had to be very busy developing MILFs of Sunville), he was actually developing the initial materials for MILFs of Sunville - assets, the design of girls, maybe even the story - the stuff that takes a lot of time and effort to make. So he had no time to work on Fashion Business and he said he was sick.
And now because he doesn't have enough time to develop two games at the same time, there are delays, smaller updates and he is even "forgetting" about spoilers.