Well after taking a few minutes to not get all wound up here is a realistic look at my situation:
2 iPhone's
1 iPad, soon to be 2 iPad's
So I'm looking at $120 a month for unlimited data on all 4 although my wife's we could probably get away with the 250.
With the new 'plan' and it does say existing CUSTOMERS keep their current plan, so even upgrading your an existing customer from what I read.
With the new setup $90 a month from $120 if I setup the Pro plan with tethering, 45 for each iPhone, drop the plan on the iPad and tether to the iPhone. I get the added bonus of tethering the Macbook and more importantly for me a backup now exists in case my connection goes out at the house.
I'd have to use 5gb per month on one device to see $120. There is no way my wife will use 2gb mostly because we work out of our house and when we're out working its together.
My bigger issue is I paid Apple $130 more for a 3G iPad and now find I don't need one if I can tether a 4G iPhone.
If this all turns out to be the case my iPad will be going back to Apple for a Wi-Fi. I've got until the 16th of June for my 30 days and I'd bet Apple will have a whole slew of people who can work a calculator wanting to return theres also.