v0.1.2 Expected release date field on products (`ProductMeta::META_RELEASE_DATE`, `preorder/release_date` filter). Release date shown on the storefront pre-order stub and in variation JSON. Hidden `_preorder_line` order item meta for add-on queries.
v0.1.1 Add `preorder/is_preorder` filter and variation inheritance in `ProductMeta`. Expose per-variation pre-order state on the variations form for add-ons.
v0.1.0 Initial release: per-product pre-order flag, custom button text, out-of-stock purchasability, and cart and order flagging, with a settings screen.