It isn't just based on what RIM has or hasn't said. In certain preview versions you can go into device settings and there is a new "Accounts" tab, where you can enter information for e-mail and Facebook accounts.
This was in the last virtual machine simulator I downloaded, and I entered one of my accounts. The vm did NOT have the actual e-mail program (deliberately held back), but I was able to successfully log in to a POP3 account and have the device give me a push notification (and even a preview from the icon on the upper left).
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