A single-core Atom will still beat these in single threaded performance. Multi-threaded performance is a different story, but I would still not expect an outright win for these Snapdragons. However, Adreno 220 is clearly superior to the GMA 950 crap bundled with most Atoms.
Coremark isn't a good benchmark. I have been benchmarking Snapdragons and Atoms myself on a variety of integer and floating point codes. I will publish them sometime soon but Atom-based netbooks came ahead of the Snapdragon based systems I had access to. I suspect this is partially because you have more memory bandwidth available in netbooks compared to mobile devices.
edit: Also, I do expect results to change quite a bit when the Krait architecture comes into play for Qualcomm.
