I play a fair amount of Casual Breakthrough, and I have noticed that some of the bots are better now. I actually like this as it makes the games more rewarding and makes me a better player. It's kinda funny when I have 6 deaths and I'm killed by a bot, just to see that the bot has already killed me 4 of those 6 times previously. In the past, this never happened.
I am not saying you are wrong, but I have not experienced the problems you have seen with them being overpowered or appearing to cheat. I also regularly get resupplies, repairs, and revives from bots when I request it. I've only seen them being more aware and sometimes better at aiming.