OK. So I'm a little hesitant to post this, but what the heck.
First, some useless back-story... There are four of us with phones - my wife and our two kids (high school age). They've both had instances where they have turned off their Wifi at school and then later went home and streamed YouTube, used FaceTime, etc., killing our 20GB shared value plan (which is $15 for each additional 1GB overage). It happened again this month. Half way through the month, we had less than 2GB's left.
I started the process to switch to Verizon on Wednesday afternoon. Called AT&T on Thursday to make sure two of the phones were unlocked and could be switched. I also had to finish off payments for my son. When I called AT&T for that, they transferred me to the service termination department. The fellow there told me about this new unlimited plan. He said it was the same cost as Verizon - $180. We chatted about it for a bit and I asked him if it included 10GB's of tethering. His response was "not yet." I did not know that AT&T didn't allow tethering. I am disappointed with his response as it was limited to saying that they don't yet have a separate allowance, like Verizon, for tethering. He certainly didn't tell me no tethering at all. Fortunately, he gave me his email address as I told him that I might still switch to Verizon if I get hit with cancellation/restocking fees from them. He switched us to the AT&T unlimited plan.
I canceled the switch to Verizon. Then I read there is no tethering and I also read that the $180 price kicks in after the second month. For the first two months, the price is $220.
He and I traded emails late yesterday afternoon. He assured me that the price is $180, starting with the first month. He said that if it doesn't, he'll issue me a credit. I checked the MyATT app this morning and it shows $220 per month. I just sent him an email.
However, tethering is working for me. I have my iPhone's wifi turned off. I have my iPad's wifi turned off. I connected my iPad to my iPhone via bluetooth and my iPad is connected to the internet.
TL;DR: I have the new AT&T Unlimited Plan and my iPad is tethered to my iPhone and it's working fine. I better not get screwed for $80.