The preparation of a new osCommerce version, V2.4.0, has started. It will have a much more modern code base than previous versions as well as being mobile friendly.

The new OSC 2.4 will require PHP5.5 and there are 5 beta releases planned before a stable version is made available.

Resources:
– Official Oscommerce v2.4.0 Beta Roadmap Pre-Announcement
– Oscommerce V2+ Responsive at GitHub