Dragon Age 4 has a fairly tumultuous development, and things are just getting started. While researching Anthem’s development woes, Kotaku
Dragon Age 4’s development started quite a while back, as far back as straight after Dragon Age: Inquisition’s expansion Trespasser. This Dragon Age 4 was codenamed Joplin.
Joplin was going to be a smaller scale game than Inquisition, based on upgraded tools from that game. The smaller scale would mean more time could be spent on player choice and consequences to those actions. The idea was that you were the leader of a group of spies in the Tevinter Imperium, taking on heists with narrative-based mechanics, like persuading or extorting guards rather than killing them. It sounded great.
Then it got cancelled in October 2017.
Before that, it was paused when developers in BioWare were pulled into helping to finish Mass Effect: Andromeda. The same happened again for Anthem, but this time it was canned for good. Then it was rebooted, with EA writing off the cost of developing Joplin, and a clean slate was created for codename Morrison.
So if you wondered why the teaser for Dragon Age 4 showed so little, it is because the game is pretty early on in development.
The Kotaku piece details more on Morrison, the way the developers feel and more, go read the full report.