It's listed in the update that there's a way to get the alpha or a pixel, but I can't find the command anywhere. Getting the R, G or B is in the expressions of the image manipulator, but alpha's not there.
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Huh... weird, that was definitely added to the code, but it didn't seem to get included in the 0.99 release for some reason. Should be in the next build.
I'd hazard a guess that it wasn't recompiled?
It should be in the 0.99.2 release now, anyway.