I have no idea what just happened.
If Himari/Princess are gone for the rest of the series, that will be a major downer.
Still, I found it to be a rather tenuous connection that Shouma's parents led to the death of Momoka. They may have initiated the attack that led to her death, but it really didn't make any sense why they would do it, much less wait until the son was born. It all seems rather arbitrary.
The only thing I was able to take away from this episode is that the bunnies (and their pink-haired master) are evil.