BioWare posted a somewhat cryptic tweet on 14 January 2020 and it clearly refers to the original Mass Effect. This sent fans into a speculation frenzy on what it might mean and remaster of the original game is not out of the realm of possibility.
Mass Effect kicked off one of the most beloved franchises in 2007 as the space opera with Shepard in the spotlight stole everyone's hearts. While the gameplay elements were not as refined as in the sequels, the story captivated those who touched it and Mass Effect gave birth to some of the characters still popular in gamer culture even 13 years after release.
That is just the tip of the iceberg full of reasons why Mass Effect is such a popular game all these years later and it's no wonder that the fans lost their minds when BioWare teased them at the beginning of 2020. The tease included a video shorter than two minutes but it consists of the opening of the first game in the franchise.
Since this is an obvious nod to 2007's Mass Effect, fans immediately started speculating that BioWare are teasing a remaster of the game. Considering the team's recent exploits were more than disappointing with Mass Effect: Andromeda and Anthem, it would make sense for BioWare to try and bring some fans back into the fold by revisiting one of their greatest successes.
This is especially true because the last BioWare game that was well-received was Dragon Age: Inquisition and that happened in 2014. Despite its success, it has been overshadowed by CD Projekt Red's The Witcher 3 later on.
Anyway, the could also mean a completely new game in the franchise, which is not a theory fans discarded entirely. As long as it's not a half baked product like Andromeda, it should make many fans happy.