Logging Ax
I doubt they’ll ever add a level of tool beyond Orichalcum anyway as there’s really no need to do so (Ori is for level 80 zones, the new area is still a level 80 zone), but if they did I’m 99% sure they’d also make the permanent tools harvest those as well.
The amount of rage from the many, many people who have bought the tools if they suddenly became outdated would be astronomical. Anet wouldn’t do anything like that.
A lot of the unlimited mining/logging axes say same as Orichalcum or just say (cuts all trees). So I doubt they will suddenly make a tree that cant be cut by them. If they did a lot of players that payed gems for the unlimited mining/logging convenience would be upset.
If there would be a new kind of material i guess they would add a mastery for it and not raise the tool level.