I'm also holding off finishing my house and have saved my gil to get an instant upgrade once the housing update drops.

Double the limit seems reasonable, but I'm also hoping for more. I doubt it would be WoW dimensions though. From a technical standpoint WoW was able to get "new stuff", while SE might still have "old stuff" to work with. So I'm keeping my hopes low, but everything bigger than double is welcoming.

Speaking of WoW, I know there are different threads for different aspects (like the ward stuff) but the extra rooms and everything looks very promising too. In an ideal world, SE would keep the S/M/L model but give the chance to have a modular system where you could enhance your house with rooms of your choice. Like spend gil to give your S house an additional room which could be a tower, a hallway, a rectangular room, a balcony etc.

I'm sure this was mentioned before already, but it just crossed my mind.