sgx535 drivers submitted upstream: 1 (Tungsten GMA500 driver, submitted March 2009, rejected due to significant chunks of functionality there purely to support closed userspace)
To be fair, the rest of the Moorestown support code seems to be shaping up fairly nicely. But the lack of a coherent story about what graphics support is going to look like isn't hugely reassuring.
The Meego kernel tree isn't really a fair comparison here - I should be talking about the Intel MID tree. That's only got the GMA600 and CE4100 drivers at the moment, and I'm told that there's consolidation work going on there.