I did a NSF summer internship at OU this past summer and was really eyeing OU as my top. However, they still heavily rely on the GRE before looking at anything else, and with that being my only weakness in my application I was rejected. I got a personal email from my summer mentor expressing regrets. It wasnt a mass email but I received it on 12/21/18. My mentor also told me they usually get their application reviews done around now and start emailing applicants near mid to end January. Best of luck to you!
edit: i just realized you wrote UO instead of OU... so apologies, I was referring to Ohio University