Unfortunately they haven't said anything about it for 3.3 so although they might still drop it on us, I feel they would have said something already if that was the plan (like they know people wanted more houses so they've stopping us shouting at them by telling us more housing is coming in 3.3 etc).

All I've managed to find on the subject from SE:

May 2015:

Quote Originally Posted by Zhexos View Post
The development team is aware of the numerous requests to increase the amount of furnishings that can be placed both indoors and outdoors. Although it is difficult to give more details on this at this time, we haven't stopped considering this, and we'll be sure to let you know once we have more updates.
August 2015 (XVIII):

Quote Originally Posted by Gildrein View Post
Q: Large size houses feel empty. Can you increase the cap on the amount of furnishings we can place?
A: We’ve been using all our energy to increase the amount of land, so we haven’t been able to touch this aspect of housing. However, with the new wards that were added, I feel that we’ve just about fulfilled the demands.

We’ll continue to add more land, but we’d like to improve the utility of each house.

However, the team that is in charge of housing, known as the Live Team, is also in charge of Free Company elements and the Gold Saucer, and they’re currently devoting all their energy to Free Company crafting and the Gold Saucer. We expect that they will be able to address this afterwards, but they will need a bit of time.
August 2015 (XXIII):

Quote Originally Posted by Gildrein View Post
Q: Do you have any plans to increase the number of furnishings we can place in our house?
A: We’re currently working on features that will automatically relinquish houses that haven't been used in some time, as well as a feature for moving your house, and thinking of increasing the cap after this, so please give us some more time. We’re first going to deal with the shortage of available land
And I don't think there's been any further word since then, so it doesn't look promising for any time soon since it doesn't look like they're even working on it yet, just considering for the future