The CAS has released their 2021 exam schedule. The Spring 2021 MAS-II dates are from April 26th through May 3rd. The exam is still a CBT exam, still given through Pearson VUE.
The full announcement (https://www.casact.org/press/index.cfm?fa=viewArticle&articleID=4889) also includes the following:
“Registration for spring 2021 exams will open on December 15, 2020, and candidates who register early will have more options for selecting their preferred site, date, and time than candidates who register later in the registration window. While we understand that candidates who sat for a fall 2020 exam may not want to register for their spring 2021 exam before knowing their exam results, candidates whose plans for the spring sitting are more certain should take advantage of the opportunity to register and secure their Pearson VUE appointment when registration opens. The window for registration will close on April 9, 2021, and the refund deadline is April 16, 2021.”
I think this means that you should register for whichever exam you think that you are most likely to take in the Spring as soon as the registration window opens and schedule your exam with Pearson VUE as soon as possible, even though results aren’t out yet. If you are correct, then you will have first pick at an appointment slot, while if you have to change later you can still cancel your scheduled slot and get a new one.
The release time for Fall 2020 results is still listed as “during Q1 2021″.