It’s no different than really any other regional airline interview. They start with basic HR type questions “tell me about a time when...”. You’ll go over any volunteer work and/or interesting items on your resume. Then you’ll progress into more technical questions like decoding a METAR or TAF, briefing an approach plate, maybe some basic Jepp chart symbology along with a possible SID/STAR (nothing your average instrument rated pilot wouldn’t know). Finally, they’ll ask if you have any questions for them (answer should always be yes!) and you’re done!
Best of luck, you’ll do great!