From the email notice:
Highlights of this release include:
- more compact storage
- vectorized expression evaluation
- improvements to grand, grouped and window aggregates
- support for non-integer dimensions within most major operators, including joins
- transactional storage engine with error detection and rollback
Internal benchmarks comparing this release with the prior releases show disk usage reduced by 25%-50% and queries that use vectorized expression evaluation sped up by 4-10X.