The three you mentioned are all ones I check as well, especially since they are all Apple focused. Just to add another one that covers not just Apple stuff, but sometimes during Apple’s live events/keynotes I like to follow along with Engadget’s live blog. Whoever writes it is pretty spot on with their quick analysis and updating what’s announced and it’s nice to follow along and read when I’m in a situation where I can’t have audio on.
Just to add another data point mine is the 9 cup version and I can’t fully make out everything on the bottom but there is definitely a “2” so doesn’t seem to be size related. Up until today I had no clue there was anything even on the bottom. Makes me wonder what it refers to.