You can always update Eclipse or GPE to latest and then point it to work with GWT 2.0.
Setting up GWT 2.0 in GPE
Right Click on A Project
Step 1 -> Goto Google -> "Web Toolkit Settings"
Step 2 -> In the Right Panel Click "Configure"
Step 3 -> Point to GWT 2.0 folder ( download it from GWT [here][1])
Step 4 -> Ensure you select the GWT 2.0 as the default by using checking box.
Step 5 -> Select Project -> Right Click -> "Build Path" -> Configure Build Path
Step 6 -> Ensure Java Build Path shows 2.0 in the library.
Clean Compile and Debug
Select Project - In eclipse top panel do "Project -> Clean"
Step 1 - Right Click on the Project
Step 2 - Goto "Debug" as "Web Application"
Step 3 - You can GPE Hosted console in eclipse.
Step 4 - Launch the application in Brower with hosted URL
GWT Compile
Select Project
Step 1 - Right Click on the Project
Step 2 - Goto "Google" -> "Gwt Compile"
Step 3 - Configure Entrypoint module in the GWT Compile dialog. Click oK.