Is "at will" employment applicable if I have a signed Employee Agreement and do I have a case for wrongful dismissal?

I was terminated yesterday (8/27/13) as part of restructuring. The restructuring happened last week (8/20/2013) and I was included in the new organization chart. The CEO mentioned that day in employees forum that no further termination would happen as a result of restructuring. The true is that I upset my employer by questioning my organization structure and proposed changes. I have an Employee Agreement with non-compete covenants that makes no reference whether my employment is "at will" or not. The agreement was signed by both parties in 2000. Do I have a case for wrongful dismissal?