Raika's room is also in the last update, you're in it when you die because you were pregnant and didn't go to the hospital in the next 5 rounds.
No that one was already in it ;)
You see the room after you finish the first level on a new game.
It's actually been in there since before the dogs update.
There is however a new stage, not just room, but an actual stage based off of that room. Seems he is planning on having an extra bonus stage or something where you play in her house...
What is new though is like you say, is if you don't go to medical center, during one of the cutscenes after 3 missions (you can just start a mission, and then immediately turn the escape flag on by pushing the pause button and exiting the stage, repeat this 3 times and you will get this intermission dialogue, presuming you have been impregnated by the dogs) you are in the room and she says she doesn't feel good. After 3 more missions you are in that room again and the baby comes out.
Still have been unable to find what uses the new animations in-game :S
If you look in the folders you can see them, it's the ones where everything is shaking like if you orgasm only while it's shaking they keep fking instead of stopping and cuming...