I've actually written about this before. I feel like with the addition of "Happy Home Designer" they certainly were testing out features with that game, which to me means that they may be creating a new experience where either instead of mayor you're real estate agent again, or perhaps you're just able to actually help with the landscaping and zoning of houses. I always felt like it was a misfire to allow for us to decorate the town but then let the houses trample all over it. Ordinarily I wouldn't be
too annoyed (which is such a strong word for what I'm actually feeling, which is next-to-nothing) if they hadn't let it go on for three games now. Maybe though they're really figuring it out!
I'd also love to see the overall mechanics of the interior decorating from HHD come to the next installment. It's nice being able to basically drag and drop on a grid and play around with more ceiling pieces like chandeliers. :3
I get real excited whenever I create an OC for this or a game like "Fantasy Life." It'd be really cool if one day we could have a game that encompasses the experiences of both - to some degree - and maybe sprinkle in
Harvest Moon, and then make it a bit of an MMO. It doesn't have to be on the level of WoW, but just having the experience of choosing if you want to play in realms with many or just a few or none would be cool, but still have the character customize options and style of the ones I listed.