Intel's i7 is a performance powerhouse, there is no denying that. However the price premium has hurt its sales and the need to switch out the whole platform is not helping either.
To help combat this Intel is going to continue the Core 2 Duo and Core 2 Quad line until 2011. There will be no new Chipsets but the P45 and G45 will be improved to allow for this extended life cycle.
According to Fudzilla this means improved support for DDR3 on the P45 and the inclusion of DDR3 1066 support and Windows 7 enhancements on the G45.