I contacted the office this morning and got some great information. Surely helped me clarify a few misconceptions. So here it is:
Most rejection emails have been sent out. There is one employer who is still making decisions (they didn't say who) but apparently I'm still on their radar (my status says "held" and has been "held" since I submitted my application). My employer selections were Draper, Sandia, and Brookhaven. So, if you selected one of these employers and you haven't received a rejection email then you may also be in the running. Additionally, if you have been accepted by any GEM university then it is advised that you reach out to them and inquire if they're willing to sponsor you as a University Fellow. The status under "planning to attend" means nothing to the employers and the message "At least one university has indicated that they are willing to sponsor you" is an automatic message that everyone gets when they self-report accepted.
Lastly, Gem is pushing this employer to make a decision by the end of this week or next week at the latest. Good luck if you're on their radar.
I hope this helps!