I just saw this on Facebook TS2 page;

The Sims 2 - SP: Mansion & Garden
Today at 8:31am

Design impressive estates and meticulous gardens for your Sims with three all-new architectural styles. Infuse your Sims' mansion with the intricate beauty of new Moroccan designs, add a touch of retro-modern style with stately and new Art Deco elements, or build in the imposing new Second Empire style. With a host of new architectural and landscaping items to choose from, your Sims mansions will look more stunning than ever!

More information coming soon!

I didn't find anything about it on the official site yet, but there's some more info here..