The October 2018 update for Power BI Desktop is filled with both small and large improvements across the entire product. One huge update is support in the Power BI service for both our composite model and aggregation previews. This enables you to start using these preview features end-to-end for your normal reports. We also have two significant data prep features: fuzzy matching capabilities when merging queries, and data profiling to help identify quality issues.
For more information, see the Power BI blog.