They can easily just interview during your rotation. You're going to get familiar with the institution, residents, and program by rotating there, so there's less of a need of the whole song and dance of the "interview day" that others will be going to. Programs don't have to submit their ROLs until the end of February so there's plenty of time to interview you and review your app in time for ROL submission.
But as said above, see what they say about an interview.