There is ongoing trials at the ATMDC in Bournemouth (Air Traffic Management and Development Centre).
I was not part of the trials but a briefing said that they would be used extensively, as it can also display what the pilot has selected on the autopilot (just level and roc info I beleive).
As you know, all aircraft will have an indivisual ID so there will be no need for individual squawks.
As you say, in terms of displaying this info there could be an information overload problem! I think that they are trialling the use of electronic strips with all the data on, but it is still at an early stage.
[ 22 January 2002: Message edited by: Bright-Ling ]</p>