Deadpool 3 isn't expected to start filming until at least 2022. Deadpool 2 followed with extremely positive responses, it seemed inevitable that a 3rd film would follow.

Disney's acquisition of Fox cast uncertainty on whether the third film would ever happen, particularly since Deadpool's R-rated susceptibilities go against Disney's family-friendly image. Reynolds confirmed Deadpool 3 to be in development at Marvel Studios back in late 2019. Finally, it was announced in November 2020 that Deadpool 3 is moving forward with new writers Wendy Molyneux and Lizzie Molyneux-Logelin.

Kevin Feige recently shared some new updates about Deadpool 3. In addition to confirming Deadpool 3 is going to be set within the MCU, he gave a thought about what the assembly timeline is going to be like. "It will not be [filming] this year. Ryan may be a very busy, very successful actor," Feige stated.

Deadpool 3 has likely stimulated many discussions within Marvel Studios, meaning it's possibly taken a while to work out how it'll fit within the MCU. From there, the coronavirus pandemic must have played a big role in delaying things, and between Marvel and Reynolds' packed schedules, finding time to figure things out had to be tricky. Nevertheless, progress is finally being made.