So no change there then.
Actually, I was mining in a double LTD hotspot yesterday. I wanted to get figures to compare double and triple hotspot mining. Bit pointless now. If I'm reading the patch notes aright, double LTD hotspots might as well not exist in future, and the triple will be the new double.
Which, if my experience subsurface mining in a double LTD yesterday is any guide, will make subsurface mining a lot less attractive - the mechanic is a fun challenge but goodness, the search for the next subsurface LTD deposit was an exercise in tedium.