Needless to say, I'm a little freaked by the weather we're having right now (google polar vortex). But I guess it's a good thing if your writing scares you.
Interesting part of writing a sequel: how to include the exposition required for new readers without boring your old readers. J.K. Rowling was really good at this, but even then you find yourself buzzing through the exposition wondering who in the hell would be reading book three WITHOUT knowing Harry Potter is the boy who lived?
So I like to incorporate the backstory slowly over the first few chapters. If you leave it vague enough, and interesting enough, new readers might even put down the sequel to read the first one. But really, who leaps into the second book in a series?