Let the hive mind of Engadget get that for you.
"We need a digital camera that can be switched on and fire off that first shot fast. It's not a commonly tracked statistic on any review site, and nobody seems to have this information for every camera. We were hoping other readers could inform us as to what small digital cameras can fire off their first pics in under a second (ideally under half a second). It needs to be small, but mostly, just really quick in operation. Thanks!"
The only problem with the old design was confusion. It works quite well. Yes, a fan on the bottom is good design: by pulling air through the unit you get even temps from top to bottom.
The gotcha: you can't put the old units on a carpet or anything else that blocks airflow.
These new ones look even better!