Thanks to someone else's sharp eyes, there is now - finally - something on the ORD site. It says:
**ECONOMY Lot E PARKING Alert
There will be on-going construction beginning May 31, 2006 until August 1, 2006 In Economy Lot E. During this time, space availability within the lot will be limited. When Lot E reaches capacity, customers will be directed to Economy Lots G and F. We apologize for any inconvenience this may cause. Necessary improvements are being made to this lot to improve your parking experience. Thank you for your patience during this time.
Wonder when they'll tell us what those "necessary improvements" are!!