It's possible OnePlus will keep the IRIS chip out as part of maintaining differentiation with the regular line.
Also for India pre-order of the 8: $600 (for the equivalent of the US base model that sells for $700.)
The info we had that the 8 was was selling for $550 in India is only partially true -- that's for the slighly less memory version.
I don't see the 8 Pro version sold on India Amazon at all. It may not yet be available in India.