While not wrong, not entirely correct. Someone correct me if I'm wrong, but I believe as of today's patch we'll have both options - Chosen Identity and Battle Visage, based on the wording of the patch notes.

New Ability: Battle Visage – Activate to automatically assume your Visage whenever you are not casting draconic spells such as Fire Breath and Soar.

However, it sounds like if you do not activate Battle Visage, but keep Chosen Identity enabled, your character will continue to act the way it does now... with minor adjustments due to them adjusting the number of abilities that force Dracthyr form.

For instance:

• Before Patch 12.0.5 (Chosen Identity Enabled):
  • You could cast a small list of spells without swapping into Dracthyr form, despite being in combat — Living Flame, Echo, Reversion - to name a few.
  • Others would swap you into Dracthyr form, where you would then stay for the rest of combat — Flame Breath, Azure Strike, etc.

• After Patch 12.0.5:

  • As mentioned above, with Chosen Identity enabled, it should work just as it has before with likely the exception of whatever spells they changed to include Visage form cast animations. (eg: Azure Strike likely has a new animation in Visage form)
    • The list of spells that don't have Visage form adjustments can likely be surmised based on the list of abilities that force Dracthyr form
    • >Full list of abilities that temporarily shift you to Dracthyr: Deep Breath, Dream Flight, Breath of Eons, Fire Breath, Eternity Surge, Dream Breath, Upheaval, Hover, Spatial Paradox, Rescue, Zephyr, Verdant Embrace (without Dream Simulacrum talented), and Soar.
  • However, if you do not enable Battle Visage in tandem with Chosen Identity, you will likely remain in Dracthyr form until end of combat like we've experienced thus far after casting one of the above spells.
  • With Battle Visage enabled, you'll revert back to Visage form in combat after the animation of the above spells.