It appears United.com has rolled out a few changes overnight. Here are the two I immediately spot:

1. "Non Stop Only" on the home page when booking a flight is now just the "tag" they probably use in the code. The checkmark simply has "NonStopOnly" with no formatting to it.
2. There's now a timer on the booking page that starts at 2min30secs (2:30) from when you select a flight and are reviewing your trip itinerary. The timer is located in the upper-right beneath the price summary. There's no wording or anything other than the timer at this time. This started late last night as I was booking a multitude of flights. For grins I let it time out to see what would happen and a pop-up window appears asking if you want to purchase the current itinerary, start a new search or go to the home page. Clicking Purchase Itinerary brings you to the next logical page in the booking process and I no longer see a timer on this page. My guess is the timer is a behind-the-scenes thing United added to bring the new pop-up. I don't think they are supposed to be displaying it on the page.

-RM