Originally Posted by N664US

If you look at A1A - A6E on Google Maps and count the number of hard stands there, there are actually 31 stands in this area, though I know not all of them are used at once. Normally during hub "waves," while there may be 4-6 hard stands connected to each "gate," only up to 3 or so flights are assigned to each one, which makes the boarding process (slightly) less chaotic. Planes still tend to be parked at stands not-in-use though, which means that moving to E might necessitate some extra towing or ramp capacity, which might tack on some extra delay time.

For your reference, I just counted, and in this morning's big 8AM hub wave, there were 18 flights leaving from the A world, and this evening in the 10PM wave there are 10. So, there might have to be some departure time shifts or gate reassignments to a handful of flights when moving regionals over to Terminal E, but it likely shouldn't be too big of a deal.