Sad, but not shocked. TAR has become a steady "back-up" player, that they probably would rather keep it as such, not commit completely to a schedule, which allow them to announce a premiere date, but then start weeks earlier, like what we just saw with 31.
As the deadline article mentions "CBS want to do something a bit different this year, but not too different.". Their first priority, it's try to fill the huge hole that is losing The Big Bang Theory, there rest they didn't want to change too much.