As Mary Jo Foley said yesterday, I can confirm now that Ascentium (the company I work for) and Microsoft have made a deal, turning over Commerce Server customers, code and rights to Ascentium.
Ascentium is a digital marketing company which purchased Cactus Commerce, this summer. Cactus has been part of the product development for years now, gradually taking over more and more of the development activities, and will continue to support released versions, but Commerce Server 2009 R2 will be the final release of Commerce Server.
You may be interested in more information here: http://blogs.forrester.com/brian_walker/11-11-11-microsoft_folds_its_hand_abandons_commerce_server_what_it_means.
I joined the Commerce Server product team at Cactus about a year and a half ago, and I assure you we are actively planning out the future of e-commerce platforms.
If anyone has any feedback or ideas about what they would like to see in the future e-commerce platform, I'm all ears.