Yes, at 5am, new lines opened up. After that happened, it only took me 10 more minutes to get through (out of security at 5:10 am).
By the way, here is another complaint about IAD, and specific to UA: The RCCs at IAD open at 6am. The RCC at DCA opens at 5am, just to support one 6am flight to DCA. There are a number of 6am-ish UA flights from IAD and yet IAD RCCs don't open til 6am. Seems stupid to me.