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I played through the beta on my early 2011 15" (with radeon 6750) no problem at all, in full screen 1680x1050 hires. Played briefly this morning and the release seems to perform similarly to the beta.

Settings were close to max (auto detected) and it was great.

Not sure whether the HD3000 will work very well on the 13", but it would not surprise me if it ran "OK" in lower detail at 1280x800.

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According to this:

http://communities.intel.com/thread/28730


it is playable on HD3000.
 
You should have no problem.

I installed and played it on my 11" 2010 Macbook Air 1.4Ghz with 2GB RAM!
I had to turn down the settings but it is playable.
 
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