Community Technology Preview 3.1 for SQL 2016 is out now and includes enhancements in several areas.
For me, really looking forward to seeing In-Memory OLTP develop. This release enhances a feature that I was initially quite underwhelmed by. Very promising sure but extremely limited and perhaps now it is becoming more of a practical solution?
We can now look forward to unique indexes, LOB data types and Indexes with NULLable key columns!
Here's the link: