According to a photo Chris Boulton took while attending the Student Day of TechEd in Australia, it looks like when Microsoft releases RC1 it will be build 5700. This image was uploaded 11 days ago so if this is the real RC1, it should be released soon.
EDIT: Now that RC1 is released and it is build 5600, what the heck was Microsoft doing with a 5700 build at TechEd? Someone make a typo in the build lab?
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