what is the maintenance for? is it for the update Sequential speeds in my area?

I have the best internet plan available in my area, Boston MA. (Tremont area) Recently, there’s been a lot of maintenance, and I’m wondering if they’re finally doing the upgrade. My current plan is 1.2 GB down and 35 up—will it be upgraded to 2.0 GB down and 300 up? I’ve been asking for about two years now, but every time I call Comcast, they just say “soon.” How soon is “soon”? For what I do—streaming in 4K and uploading files/videos to YouTube—I really need speeds of 300 upload or more. When will this happen? Is it related to the upcoming maintenance? And when will I be able to get the XB10?