Well, I picked it up, but on account of how horrible the PS3 load times were and how shit I am at spectacle fighters, didn't get very far.
Self-deprecation aside, I can't see what value there would be in pullingMinfilia LilyAscilia forward through time. Minfilia's supposed ability to "clean up the excess Light" from the First Shard was implicitly linked to her status as Hydaelyn'smeat puppetemissary, something her younger self does not share.
It's definitely a plausible scenario if time travel is involved (and between the talk of "undoing [a] tragedy" there's likely to be either time travel or dimension hopping shenanigans afoot), but the specific scenario I can't picture a reason for with what we know at the moment.
Ah... I need to go into a full analysis of the Shadowbringers teaser, but I'm too tired to do that right now. Maybe tomorrow.