A new 3DS Animal Crossing has been announced for the Nintendo 3DS, and is due out this September 25th.
Happy Home Designer seems to be less casual sim, with more of a focus on the specifics of the town building and home decoration. Anyone that played New Leaf and wanted to decide exactly where a town project would be positioned, to tweak your house layout, here you can.
It's unknown if the standard sim gameplay is still included in the title. We'll hopefully find out soon.