The Point of Sale module has been reorganized and updated to use Odoo's newer internal framework. This should make the checkout system easier to maintain and test, helping reduce future development risk without introducing a specific new business feature.

The marketing module has been reorganized and migrated to Odoo's newer internal framework. This change should not noticeably alter day-to-day use, but it helps keep the module easier to maintain and compatible with future improvements.

https://www.odoo.com/web/#id=12044&view_type=form&model=project.task&action=333&active_id=248