Don't know if they'll have a naturally developed hive mentality, but be willing to bet they will have an artificially developed hive mentality, highly computer aided (not Borg but close).
Because we have examples of how a special class in a species can hold technological secrets from the masses (eletric batteries in ancient times, for instance), we can surmise that some intelligence could withhold certain behavioral enhancements or utilize certain behavior enhancements. What one generation decides to make it's ultimate goal may be 'programmable' if enough of a gulf exists between the ruling class and the ruled.
Mostly because of Christianity, we in the West tend ot believe God wants us to have individual freedom, at least to the extent that we may cxhoose to believe or not believe what God offers to us in very limited doses. We have developed this insight due to what we believe is a spirit component of our human souls, a component not in the animal soul of our closest mammalian relatives. If Earth is the only planet where God has placed a spirit component tied to dimensional realities beyond our perceived spacetime, then what would an intelligent, benign species on a planet become without a spirit component to develop the concept of right and wrong? Would such a species even evolve long enough to become space travelers? ...
So many questions to ask when I see Him face to face ...
We'd better hope not!