Arcane changes- Mana Shield/PB?

So new arcane changes have come out and they’re great! But Mana shield has been moved from a talent to a baseline ability for arcane, however prismatic barriers still around? Does this mean that arcane no longer gets a choice and HAS to use the mana shield version of PB (use mana to negate damage) ? What’s the relationship between these abilities now?
Thanks for your thoughts!

I don’t have beta but on the PTR the talent is gone without Mana Shield being baseline.

My assumption is that it will be turned into a PvP talent.

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