This sounds like a two-way approach to appeal to the fanbase.
1. PC mods have been around for a while to do this exact same thing. This is just allowing PC modders to test a new ability to create houses, almost as if Bethesda is saying "here's a template for you guys made by us, go nuts!" I'm guessing this expansion will be modded like crap over the next few months. Gotta check back with the Steam workshop to see what they come up with.
2. This is allowing console users to get part of the PC experience, as mods like this are already available. This gives console users the ability to build their own home like the PC users can already do.
There seem to be bonuses to both sides, but it's nothing new if you own a PC version. I guess just an "official" house mod for Skyrim. Better for consoles, but a new realm for modders.
Honestly, I'd like to see what people do with this on Steam's workshop page for Skyrim.