It's not entirely over. There may be no more books, but JK Rowling said she is going to write a charcter encyclopedia which will include unpublished backstories as well as what happens to characters & the wizarding world at large after the end of the 7th book.
The entire article is here, but read only if you've finished the 7th book as it contains many spoilers!
Btw, my reviews for 13 Little Blue Envelopes and Harry Potter & the Deathly Hallows are still coming. Be patient please, I've been working hard lately to get all my college plans in order :)
EDIT: There's another article here that gives a tiny bit of info on some of the characters to do with what happens to them after the epilogue.