What are the plans for merging this in with the released version of the ScalaTest plugin for eclipse?
Thanks for the question!
Actually, there was a discussion about merging things together with Specs2/ScalaTest and the plug-in. Unfortunately I let the ball drop (the sad thing is I have to focus on writing my PhD at the moment). I hope to catch up things during the Christmas holidays with Eric Torreborre and Bill Venners, so the answer is definitely yes, but I cannot promise any deadlines for that at the moment.
Btw there is a working version of the ScalaIDE with the ScalaTest plugin and specs2-runner, you can find it here:
Unfortunately they are a bit old and aren't compatible with the latest versions at the moment.