It’s amazing how many commenters here respond in all seriousness to tongue-in-cheek suggestions.
I’m hoping the big surprise is Yoda vs. the new spider Ady added in order to better line up with the prequel version of Yoda.
If there was one thing ESB needed, it was Yoda vs a giant spider.
Jedit: Have the lightsaber travel in an arc and cut all the legs off in one single swoop. Haven’t seen that in any of the movies yet.
Not sure if serious, semi-serious, or unserious.
[JEDIT]
To those with sarcasm detectors on the blink, the above fits into the third category.