Tested exporters with new Blender 2.55 Beta. It seems both old and new one...

Tested exporters with new Blender 2.55 Beta. It seems both old and new one work without any changes \o/

utils/exporters/blender/2.54/scripts/op/io_mesh_threejs/export_threejs.py

@@ -100,7 +100,7 @@ def save(operator, context, filepath="", use_modifiers=True, use_normals=True, u
     # incase
     color = uvcoord = uvcoord_key = normal = normal_key = None
 
-    file.write('// Generated with Blender 2.54 exporter\n')
+    file.write('// Generated with Blender exporter (compatible with Blender 2.54 / 2.55)\n')
     file.write('// http://github.com/mrdoob/three.js/tree/master/utils/exporters/blender\n\n')
 
     file.write('var %s = function () {\n\n' % classname)

utils/exporters/blender/2.54/scripts/op/io_mesh_threejs_slim/export_threejs_slim.py

@@ -55,7 +55,7 @@ TEMPLATE_FILE_ASCII = """\
 //  faces: %(nface)d 
 //  materials: %(nmaterial)d
 //
-//  Generated with Blender 2.54 slim exporter
+//  Generated with Blender slim exporter (compatible with Blender 2.54 / 2.55)
 //  https://github.com/alteredq/three.js/tree/master/utils/exporters/blender/