There are certainly numerous questions surrounding Ward's resignation. Paramount being: Um, why is he leaving? Ward was expected to speak at D.I.C.E. in a few weeks with ESA president Michael Gallagher, and he was also on the Executive Committee of the ESA's Board of Directors. We'll update as more information comes in.
Update: LucasArts confirmed with GameDaily BIZ that Ward will not be attending D.I.C.E and his presentation was scrapped. A company spokesperson also said a search for a replacement has just started.