since yesterday's restore, and turning off (at someone else's suggestion) the "raise to speak" function for Siri, I'm at 45% after about 8 hours of periodic use. I have wifi on, exchange mail push notifications, a location based reminder all active, and have been using Siri on and off. This is pretty comparable to my sporadic usage and battery results at the end of the work day from the standard iPhone 4.
The problems I was having, with significant drain (1 percent per minute) and a warm phone even when idling were occurring this weekend prior to a full restore.
It's possible that either a system or application process got hung or that the battery power management piece of the firmware was corrupted. These things do happen. If a hard reset and full restore don't fix the issue, I would take the phone in for a battery diagnostic and repair/replacement. Right now I'm convinced that, just like with every launch, different people are experiencing different sets of problems. Some are battery related, some firmware related, but they all have similar symptoms.... just different root causes.
Update: Using for the last hour and my battery has gone down maybe 2-3% tops. Much better than prior to yesterday's restore.