As of now the branches are synchronised, but later in the year 6.2 will have more features applied than Eraser 6. I can't detail what's going to change yet, but it'll diverge soon. Check the Trac timeline to see which branch has got what changes.
Well they're still synchronised, so the 6.0.x version doesn't yet change. The 6.2 is there only because in the development tree 6.2 is trunk, 6.0 is a branch (I'll be applying fixes to 6.0 branch then forwrdport to trunk later since this makes more sense IMO)