In case you were wondering, “spec” is short for speculative and it means this was an unofficial ad created by a third party as part of their personal portfolio to showcase their creative skills. In case this, the director - Stewart Hendler is obviously not short of talent. Human Worldwide who produced the soundtrack also deserves a lot of credit for a mesmerizing composition.
A recent interview on Screen Magazine with Human reveals some details.
Microsoft, Zune, Media Player