LPDAL, thank you for your hard work on a fantastic report! To answer your question, the new United Club at ORD is in Terminal 2. Also, just some gentle corrections: Etihad is based out of Abu Dhabi, UAE, not Saudi Arabia. Also, the FedEx bird you spotted is, I believe, a DC-10, not MD-11.
I will indeed miss the 757 for its powerful takeoff and large F cabin (read: high upgrade percentages
).