The most surprising part of this episode was Honoka becoming the student council president. I did not expect such a development, and I was even thinking we were still watching a dream scene for a while (the awesome musical sequence at the start certainly didn't help with that).
All in all a solid first episode. I expect a lot of fun from S2, but I also hope it doesn't play it too safe and copy S1's formula down to the letter like
Strike Witches S2 did.
Some references to the PVs in episode 1: