The main change in this upcoming patch is an adjustable housing hook system that sounds similar to what’s used in SWTOR: “You can now adjust the precise location of interior housing decorations once they are placed in a hook. The decoration hook UI now includes four scroll bars that allow decorations to be rotated as before, but also to be moved east/west, north/south, and up/down. Exterior housing decorations continue to only allow rotation.”
The test server patch also includes additional chat channels and premium housing writs to facilitate the transfer of the newer houses.
Source: Patch notes