On the Escape Lounge Facebook page, they've officially announced their opening in January 7th. Someone asked if they're going to be staying open late night to greet CI guests and they said they're staying open for CI. So, for those not wanting to be stuck on CI's baby lounge, they could head over to Escapes' lounge.
I checked their website, and it seems they're also building a lounge at T4. Perhaps they're doing this in the mean time before ONT gets enough traffic to build that connector between both terminals, and have one centralized lounge for all passengers.
With CBP wait times, they finally updated for all December. For CI they scanned 7959 passengers. So this out of 9846 means that CI 24 had a 83.9% LF for December.