Finally got the email, didn't get the fellowship. Seems everyone who has received it this late is an applicant for the dissertation fellowship and is getting an HM. Sounds a bit fishy but probably just my paranoia.
Thanks for this info grader_ade. I called and just as you said, they seemed to be entirely unaware that a good many of us had not received an email. They said to send an email to infofell@nas.edu to inquire about the status.
That's not for eligibility. It clearly says the application is open to ALL US Citizens but that people who fall into one of the categories you listed will get special consideration.