Personally I think they'll ease the current progression of the 2.x relics to make it easier to catch up to 3.0 and then possibly have 2 relic options to upgrade and choose from. That would give players without relics the chance to catch up or simply get the new relics while still keeping the current option from becoming irrelevant.

Maybe the newer relics will have a harder progression path so that people have an option between the current grindy relics and a harder to obtain but less grindy option.