In a blog post suggesting limits to the usefulness and applicability of the Lambda Architecture, Jay Kreps argues that Lambda contains valuable ideas but that ultimately it is a temporary solution due to immature tools rather than the future of big data.
Causal Consistency models offer an alternative Eventual Consistency for distributed systems; both models should be weighed against your system's requirements and risk tolerance.
The recent theft from several BitCoin operators has sparked a debate whether eventually consistent databases are useful or not for banking.
FoundationDB database platform combines NoSQL scalability with ACID transactions across all data within the database. FoundationDB team announced last month the availability of its new NoSQL database platform.