Waters will most likely be touring the U.S. in 2010 with the original Wall tour, the largest tour in the history of music.
Could Coachella be a stop? We will see. For those not in the know, the original Wall tour changed how we see rock concerts - it's incredibly revolutionary. See the 1980 NYT review:
The 'Wall' show remains a milestone in rock history though and there's no point in denying it. Never again will one be able to accept the technical clumsiness, distorted sound and meagre visuals of most arena rock concerts as inevitable" and concluded that "the 'Wall' show will be the touchstone against which all future rock spectacles must be measured
It would be cool to see this go down. To be at Coachella watching them build the Wall during the first half would be amazing.