Lights, camera, ACTION! Michael C. Hall and *hopefully* some other familiar faces from past seasons of Dexter are set to return to their roles this January, after seven years. 
Production for the forthcoming Dexter Revival is set to begin in early 2021, although the current situation with COVID-19 may change the schedule a little bit. Rumor has it that the upcoming 10 episodes will take more time to film... to be specific, a couple more months than usual. Not sure if that's because of more demanding scenes, or just a "slower" production due to Coronavirus.
More filming updates and casting coming soon. Stay tuned, Dexter fans!