Next year *is* a player option, but since it is a league-minimum contract and Curry has been playing very well, it appears he will opt out.
If he does opt out, he will indeed be a restricted free agent (dependent on our tender of a qualifying offer - but that would appear obvious) based on his being a three-year veteran (
http://www.cbafaq.com/salarycap.htm#Q44). This means that if we give him a QO, we have the right of first refusal to match any offer sheet he gets - but since we do not have Bird or Early Bird rights on him, we will have to have cap space in order to do so. As of now, best guess says that we will start with on the order of $20M in cap space, but we should keep in mind that we can't go over the cap to match an offer sheet.