How would the subsidies proposed for health insurance in the reform bill be determined?

Would people who have higher insurance premiums get more of a subsidy? Or would the subsidy just be based only on income, so people at the same income level would get the same subsidy even if some of those people paid 5 times as much in health insurance? How would the subsidies be administered and paid? Would it be like applying for welfare? Or would it be handled through the tax reporting system? How many people would have to be hired to handle this?
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The $64,000 dollar question. And if anyone answers this with a real answer they will be lying.
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