1. Scott Moritz was, is and will always be a liar. Never believe anything he writes. For those not familiar with him, he wrote that the iPhone's production was being halved, then when that clearly didn't turn out to be true, said that dropping 4GB model was the same as cutting production in half. He's too stupid to even be a good liar. Legal disclaimer: JMO
2. NO ONE outside of the highest levels of management knows ANY of the terms of the aapl/T iPhone contract. No one. It was never said that it was five years exclusive. That rumor originated with a poorly written USA Today piece. It has possibly been acknowledged that T will support the iPhone and have certain distribution rights for 5 years.
3. If anyone thinks T has/had the upper hand in any dealings with AAPL, please contact me--I have a bridge to sell you. T handed over the keys to the store to get the iPhone, giving unprecedented control to AAPL. They needed each other, but AAPL clearly was in the driver's seat. There certainly would have been benchmarks, incentives, escape clauses and even kitchen sinks in the contract, but everything appears to be going well for both parties so I seriously doubt any major changes have kicked in.
4. It is highly unlikely that 8GB will be around much longer, except possibly to occupy a lower price point spot like the 4 GB did originally. Reason: with all the new apps which will be available for the iPhone, it's in everyone's interest to have more capacity.
5. See point 1 above.