Quicksilver has been in the news lately because he might be in two movies from two different studios over the next two years. Not bad for a guy who has only one short lived solo series. He is a long time Avenger with his sister the Scarlet Witch and he has had his ups and downs and has crossed the line between hero and villain. (And he crossed that line a few times.) Also he has been in X-Factor.
It will be interesting to see how this situation with Marvel and Fox works out. I think it would be best for Marvel to get the rights back to all their characters but I don’t see that happening any time soon. Sony put a new Spider-man movie out to prevent the rights from reverting to Marvel.
What separates Quicksilver from the Flash traditionally are his power level and he is often abrasive personality. While fast, he has never been as fast as the Flash. Quicksilver could never use his speed to travel through time. Quicksilver can be abrasive.
I look forward to seeing him. (Just not in the green costume.)
His sister, the Scarlet Witch, is not currently rumored to be in the 2014 X-Men Days of Future Past movie. I am not sure if that is significant or not.