Just re-posting here to let you know what I think it will mean!
From what I could gather, these will be the consequences:
1. Most grade boundaries (for 2009 specifications) will increase to make up for the teething process into the new syllabus for last year. For example the A* boundary in geography might go from 49/75 to 56/75 despite a seemingly harder paper. This is because last year people were still getting used to the syllabus.
2. Science grade boundaries (old spec) will stay relatively 'low'. New spec grade boundaries will be significantly higher to make up for hardening of the syllabus.
3. English grade boundaries will be set so that roughly the same proportion of people will get A*, A, B, C etc. as in the previous specification. In the last specification grade boundaries were stupendously high, but because the specification is new I'd expect grade boundaries to stay roughly the same. For example English Literature Unit 1 might stay at 45/60 or possibly decrease a little due to more people taking (I assume) and a harder paper. Then, I'd expect them to increase the grade boundaries slowly over the next few years to roughly 50/60 for an A*.
4. The SATs results will be used in the future to suggest how well a particular year group should do compared to the previous year group. For example, if Year 12 did better than us in their SATs as a whole year group in the country, then the exam board would expect us to get lower marks for the same grade boundaries. Therefore, grade boundaries would be likely to increase. If it was the other way round, we would get lower grade boundaries. However, I do not know whether this is a player this year.