1) Bulk selection of keywords has improved.
You can now choose how you want to bulk select keywords (current page only or all pages).
It makes things easier if you want to analyze / hide a selection of keywords from the page you're viewing.
Read the announcement here.
2) Speed of clustering has improved.
The clustering algorithm was adapted. It's now more efficient on large batches.
3) Word count included in the clusters Excel
The clusters Excel (from the clusters tab) contains a new column : average word count (for the main keyword).
You'll now know the minimum number of words you should aim for when working on clusters.
PS : You'll need to fetch the word count of your keywords to get that data.
4) Visibility of related searches
The related tab now also contains the visibility column (ie. how many times the related keyword appears in the SERPs).
Not sure which related search to analyze ? => sort by visibility and analyze the most visible ones.