Bioware have confirmed that the studio is working on Dragon Age 4 via a teaser trailer that was shown off at The Game Awards 2018.
Other than the game is known as Dragon Age Dread Wolf Rises and that it seems that Solas will be returning, judging by his voiceover in the trailer., not much more is known on the game at the moment.
Rumours that the next Dragon Age game would be shown off at The Game Awards had been circulating before the show with some of them also speculating the game is still several years away from release.