GD Products Center 1.3 is currently in development and it will be released in about 4-5 days. Plans for the development have changed a bit in the last couple of weeks, and some things were necessary to go into development sooner. Plugin roadmap is updated to reflect this.
To allow interconnectivity with products and companies, all normal post types can now use metaboxes to link to companies and products. These metaboxes can be assigned to post types you want. Shortcodes can be used to display linked products and companies, and functions will be available also for use in templates.
Other changes will include improvements to filters, templates and other things. Also, reported bugs are fixed.