BAS supports new selector syntax. Several selectors may be combined.
All old selectors and all old projects will remain to work. You can even edit old style selectors and combine old style and new style in same project.
Example of new selector:
>CSS> .element-class >AT> 0
More information here: http://wiki.bablosoft.com/doku.php?id=how_to_search_for_element
Xpath support. Element can be located by xpath, for example:

Xpath selectors are autogenerated and editable, same way as css.
Html5 drag and drop support. For example this site now works in 16.8.0 BAS version. http://html5demos.com/drag
There are a lot of stability improvements and standarts support:
Switching between tabs updates focus.
Fix html-manifest ip leak.
Run process module works through batch.
Solver properties are individual for each thread.
Css constructor supports ids, which starts from digit.
Fix file upload with Blob.
Fix crush during initial script execution.
Local storage replaced with native implementation.
Page source returns whole source including head.