I managed to setup Eclipse, Subversive and I checked out Vassal Trunk (3107).
When I try to run it, I get a v2.9.9 menu. Any idea why 3107 would have a 2.9.9 menu?
Silly me!
I was selecting the org.vassalengine.Main in my Run config as stated in the Wiki whereas I should have used the VASSAL.launch.Main (I discovered this one using the Search button)