Yes, tons of new content! Play it!
One thing I think should maybe change is the ability to renovate the basement in the safehouse. If you just don't go get Cassie back, she doesn't really own the ruins and she probably has no hope of escaping captivity on her own, so ownership of it should probably transfer to the player at the point she is kidnapped by the Don's goons. I'm not like one of those people who tries to stuff my ideas down a creator's throat and tell them how their own work should be, but that is a little hole I noticed.