Just an update.
Frontier finally officially cancelled my original flight for Wednesday morning around 10:30pm Monday night.
The rebook options were for Thursday, due to land at MCO ~7pm. There was an earlier flight in the morning, but that looks to be also gone/cancelled, so maybe they think/know MCO will still be closed Thurs morning.
I could've refunded for airline credit, which I wasn't really interested in. Refund back to my CC required a call apparently and up to 2 weeks.
Considering this flight was only ~$55, taking the refund and rebooting with another airline ($300+) isn't as ideal. I also have a separate flight leaving MCO to BOS for a separate work engagement, so I do need to somehow be in Orlando before the following Monday.
Hoping for the best for everyone there!