Cultural Anthros:
I emailed Deborah Winslow about notifications and thought I'd share her response:
"Thank you for your message.
The dissertation proposal recommendations are being finalized one-by-one; there is no mass mailing, so researchers will indeed be hearing at different times. We hope to be finishing up within the next two weeks. Generally, with an NSF proposal, you should allow 6 months from the time you submit it until you hear the outcome.
Very best,
Deborah Winslow"
Also it may be worth noting that she has an away message indicating that she is out of the office until 4/30. So it seems fair to assume we may not hear until May.
Until then, try to breathe.