Microsoft published information about it’s research project Trinity, a hypergraph DB.
Trinity is a graph database and computation platform over distributed memory cloud. As a database, it provides features such as highly concurrent query processing, transaction, consistency control. As a computation platform, it provides synchronous and asynchronous batch-mode computations on large scale graphs. Trinity can be deployed on one machine or hundreds of machines.
At this time, Trinity is not available for download or use, but it’s already used in production internal to Microsoft.