This article presents NuoDB as a Cloud database. It also claims that NuoDB is ACID compliance. At the end of the article it is clarified that the company works on making NuoDB to be ACID compliance in a cloud.
According to CAP theorem scaling out a consistent database requires to compromise availability, since unavoidable synchronization between all databases cannot be performed fast enough over a network due to at least latency.
It will be interesting to see how this problem will be solved in NuoDB if so.