I was in Batopilas this last easter week and the road was all paved except for the last 24 miles coming from Creel. Due to the construction the first 1-2 were torn up pretty good. There were some spots in the 24 miles where there was other construction going on so be prepared for other issues. Be prepared for crowds if you going in that time frame. The weather was great and there were no issues. Plus the hotels in Batopilas were not full, but they could have been with just a few more vacationers. Remember the issues with the TVIP and other documents that are necessary.
We Rode GS s and had no issues. If you are riding a large bike like the GS you might want to eat your Wheaties just in case you drop it in the dirt, or pack light.
Hope that is what you were looking for.