Was interviewed by over half a dozen folks over the course of a day. Almost all questions were technical and delivered by senior technical staff. For example - draw a system diagram (HW & SW stacks), label the components (CPU, southbridge, IRP, IRQL, DPC), answer questions regarding their function (MMIO, paging, interrupt handling, DMA, cache coherency, snooping, IRP & IRQL handling) starting general and progressing as deep as you are able. Some were fishing -- looking for specific answers to specific questions -- rather than asking open ended questions that might allow you open-up and shine.
Hints of behavioral questions mixed into 1 or 2 casual questions. None of the point blank "tell me about a time" questions. Two interviews by managers. One was the reporting manager asking what I was good at, liked to do, and where I saw myself going. Was very open and understanding towards growth and change, that I could use the position as an opportunity to springboard into other positions when things got stale. The other manager was a director who got straight to the point: compensation, availability, response turnaround time.
Impressions: It seemed that people were wound tightly and schedules were very aggressive. Business-like, to the point, only type-A personalities need apply.