This update is not too big (yet) and is mostly pet orientated with the Pet Achievements we found earlier and some of the new pet furni we reported about earlier. Pets are a whole lot more fun to be around but also more demanding.
The pets system (right) is more advanced and encourages users to buy food and water and beds for their pets. Different food and items affect the pets in different ways allowing them to evolve in different ways.
They can now gain experience when training, each time they get full experience they level up enabling another command to be taught, but each time you command them to do something, their energy goes down meaning you have to give them food, water or let them sleep.
There are a total of 16 training options but 20 levels, so what are the 4 extra levels for?

As well as this, there is also a new place in the inventory for your pets. You can now carry them around and take them to different rooms (sadly not public rooms yet).
As well as this you can now disallow pets in your room in room settings by unticking a box like the one below:

Also it is handy to note that Xmas rooms have been added to the navigator (for xmas? for snowstorm? for ice age 3?) and the Habbo News and Minimail boxes have been fixed in most (if not all) browsers.