Wow I didn't realize this was confirmed.
Yes I am excited, with a mild hint of scepticism.
I am excited because Mass Effect was an amazing series. There is no game that has more memorable NPCs than Mass Effect. It was 3 years ago since I played Mass Effect 2, so I have forgotten about some of the companions. And while I was playing ME3, when I saw some of the companions pop up suddenly, I was like "Hey it's you!", and was pleasantly surprised. That is because the companions have great backstory. I actually like listening to my companions whenever I want to know more of them.
I did not feel betrayed or burned by the ending offered in the Extended DLC. I thought Mass Effect 3 had incredible story, meaningful deaths of important NPCs, the story was just done right. It invoked strong emotions from me. 10/10 for the story for me, and I feel the so-called outrage from a certain portion of players are gross overreactions. Maybe I did not see the original ending, but the Extended DLC ending is just right for me.
Now, for the scepticism. I am sceptical because I think Mass Effect should end on a high note and not be milked further. There is a danger of trying to milk a franchise for all its worth, and it may be what happened with Assassin's Creed.
Some people remarked that it should have ended with Revelations, and it would be a fitting end for Altair and Ezio. The story was also amazing. But because they try to milk the franchise for more sequels, the story, characters, gameplay all feel flat in AC3. It's like you have a great story meant for 4 titles, but because you try to stretch it for 10 titles, it will feel long-winded.
I am worried that Mass Effect will go the same route. Just as how no one can top Ezio, I am worried that because no one can possibly top Shepard, whoever the new protagonist in Mass Effect 4 will be, will not be well received and will get a huge backlash, if you consider that despite the amazing effort they put into Mass Effect 3, people still attacked Bioware for the unsatisfactory endings.
So I am excited with a hint of scepticism. But hopefully I am wrong about the scepticism because Mass Effect is an amazing IP with great and interesting lore, so great that I feel they should be made into a movie and it will rival Star Trek.