Personally I think that some of these rumours are rather obvious.
iPad 512MB RAM, with the iPhone 4 using 512MB already - dead cert.
Cortex A9 in 2011 - this is also most likely, as this core will be in common use by then. I'd expect dual-core to be honest.
iOS based Apple TV - also very likely, to prevent platform split.
AMD Fusion based Apple TV - unlikely, as it is a much higher cost than creating an A4 (or better) based device. However AMD will have proper integrated graphics with Fusion, so it's the second option.
7" iPad. This is a more portable form factor, and will be desirable to many for that reason. The smaller screen could also reduce the battery drain, but there's less space for the battery. Weight would also be dropped (to under a pound most likely), making it far more portable. I can believe the rumour, but it might not become reality (it's surely designed, but is it going to be released?).