just stepping in here as Cameron has been off support today due to an internal project.
My suggestion would be to read up as much as you can about the new item to make our own decision at the end of the day, but we all think the O3 is a super cool bit of kit, it essentaly combines a gopro with the air unit which may be perfect for what you want.
The O3 is essentially an update version of the vista, but it is larger and heavier, so more of a direct replacement to the full size air unit. We have them on pre order here -
The O3 is backwards compatible with the Goggles V2 but at a lower resolution than goggles 2 (810p vs 1080p) , but we will also get the Goggles 2 when they are officially released.
Its not known at this stage if the goggles 2 will be backwards compatible for use with the Vista air units, but we all hope they do this.
Hope that helps, any other questions just let us know.