For about a month or two, we have heard the Joaquin Phoenix was in talks as a possible Doctor Strange. Marvel confirmed such a rumor and we were all just waiting on the official announcement. Now, the announcement has come. Joaquin Phoenix is NOT Doctor Strange. The negotiations have stopped and Phoenix will not join the MCU.
I liked him as a choice for the Sorcerer Supreme, but I do trust that Marvel will find a suitable replacement, and probably in the next couple months.