In his update to his First Impressions post, Josh Strobl points out that
There were some design changes made to the interior (TOH2 side) to hopefully give any prospective TOH2 hardware designers in the community some more flexibility. I’ll let Jolla dive into that since you never know if it’ll evolve further
Elsewhere in the post he says the fit of the OH feels better, whilst also noting other changes to that side, including the battery cover plate, so that suggests the final form wasn’t ready in March.