For awhile, the new Hawkeye 2000 program is not even halfway finished.
And new airframe improvements are coming also (props, flight deck), along with those system improvements.
FYI- The E-3 RSIP program is almost done, with 40/45 coming around 2010. The E-3 will be around until 2025, with the E-2 till at least 2020-25.
Ciao, and Hook 'em Horns,
Capt-AWACS, Watching you from 30,000ft (for the government)
Io voglio fica ogni giorni da mia bella moglie!