The development of a 'scout' by allowing  the smaller, lighter drones the ability to fly would be useful for getting an idea of the landscape for ourselves, even with the benefit of the Bees sharing some of their knowledge with us. Plus it would give us the benefit of having drones who can fly and work on areas where they wouldn't be able to reach normally. 

Alternatively, we could begin attempts to develop a strain of workers who can handle water; Namely, so that we can benefit from the nearby river to the north.