New Olympus 8mm and PT-EP10?

In reading the press release for the new 8mm fisheye PRO lens from Olympus, I see this paragraph (emphasis added):

Underwater Lens Port, PPO-EP02

This accessory is 15% smaller, and 30% lighter than the previous Lens Port, PPO-E04, for a more compact and lightweight product. When exchange the lens port on Underwater Case for the E-M1 (PT-EP11) or Underwater Case for the E-M5 (PT-EP08), a compact system with the M.Zuiko Digital ED 8mm f1.8 Fisheye PRO even underwater is available.
The hood section can be removed to reduce waves for over-under shots.
(Rear Cover (PRPC-EP02) and Front Cover (PBC-EP02) are bundled)

There are plans for starting a lens port exchanging service on Underwater Case for E-M5 Mark II (PT-EP13), for E-PL7 (PT-EP12), and for E-PL5/E-PL6 (PT-EP10), with the PPO-EP02.

A firmware update that adds the Underwater picture mode to the OM-D E-M1/E-M5 Mark II is planned to be released coincide with the sale of this lens. In addition to the traditional underwater mode, it will be possible to capture vivid underwater shots even in P/A/S modes without bluish tint.

I think it is clear that the new dome port is for Olympus OMD camera housings. It appears that this new fisheye will work with several of the current ports.

Reading the specs it seems as if it is not much larger than the 9-18 mm in diameter and is shorter than the 9-18m at full extension.

But if you look at the Olympus UK page for this port, there is also a statement about using this port with other housings:

"If you would like to attach the PPO‑EP02 Dome Lens Port to a underwater house with fixed lens port, please contact our support line on 00800 67 10 83 00"