Beta Testing: Can we EDIT A MAP in the new BETA map engine?

I can make maps in the beta engine and save them to my profile.  But I can't find a place to open an old map or even re-open the newly created map in the new engine to attempt to edit it in the BETA route maker.

Is this feature coming?

I ask because it's the editing part of the process which used to be the slowest.  Opening a map was not so slow... but asking to edit the route was the process that usually grinds things to a halt.

thanks,

victor