I would generally ask about project plans, and then perhaps more specifically what they have planned for me, i.e. what they are actually recruiting me to do, whether there is anything specific new or exciting I will be working on, or whether I am just filling in a head-count or replacing someone who is leaving so I can fix their legacy code / bugs.

In reality I am not sure whether this section is part of the selection process for them or part of it for me if I get more than one offer, although if I am already in a job and considering moving, it certainly is important for me to know that I am moving somewhere better than where I am now for a career perspective.