The press release says it:
Major Linux vendors and non-profit organizations today officially launched the DCC Alliance. The Alliance plans to assemble a common, standards-based Debian core for Debian-based Linux distributions, accelerate worldwide commercial adoption of Debian, promote compatibility among the growing community of Debian derivatives, and work with Debian on features important to commercial adoption such as a predictable release cycle and Linux Standard Base (LSB) compliance.
Interestingly, Ubuntu is not part of the founding members.