No.
The way things were being stated here and various sites was leading toward a $29.99 fee for unlimited.
As far as tethering, it was my understanding that it was a capability within the service itself. Not an additional fee.
Of course, I should have known better. Regardless of tethering, the $50/month for unlimited really kills me. I didn't realize ATT charged $45/month for 2gb.... I'm basing my price analysis on what Verizon offers for their non iphones, so, yes, IMO, tacking another $20 on the data plan just because it's an iphone is enough to make me stray away. Regardless of what they think is clever marketing.
furthermore, I'm at $50 sans voice plan.... and even sans texting plan. I was thinking $150 would be about right for unlimited, 700minutes, and 500 texts. Now the price is closer to $190. If you're okay with that, great. I, however, think it is quite high. We pay $70 less for tmobile unlimited data, 1000 minutes, and 400 texts. I'm not talking chump change...
Edit: maybe I'm reading it wrong. But, it seems to me that you're inherently getting hotsptting with the fee. So, you can't opt out, making the base unlimited data price for the iphone $49.99. It was my understanding, when initial details were spread out, that hotspotting would be inherent, yes, but not at an additional cost.