Youtube Go
It’s a new app from Google, which you can read more about HERE
And on that website you’ll see this logo:
That little red rocket has already been the subject of a trademark application by Google, and I would have thought it was the logo for Youtube Go
However, just this week, they (Google) also applied for a trademark in the Phillipines for this:
And they have applied for it for the exact same stuff as the earlier red rocket
So, I’m going to go out on a limb and say that this is in fact the new logo for YouTube Go