It's been stated that eventually the whole game will have this sort of loot generated items.
So, yes based on that, T-maps & SoS chest's will have the new loot.
Though i know people will disagree with this, but I think Existing T-maps & SoS's should remain the normal loot, and only newly obtained T-Maps/SoS' generate the new stuff. Otherwise people (like me,) who have about 500+ lvl 5-6 T-maps will have all of it, as soon as it goes live.
Hopefully (like Shame & Wrong) certain things are only obtainable in these specific places, (whetstone - Shame / Assassin's Edge Weapons - Wrong + some stealables) things like this keep area's useful.
I'm sure the T-maps will be alot harder than they are currently, but if the loot is worth it, people won't be complaining.