New feature's in s/4 HANA 1909

Hi Guys,

Although I'm asking this question before releasing of s/4 HANA 1909 :), it would be nice if someone can share any preliminary document or any blog which is shared by sap for possibllly new changes/features in s/4 HANA 1909 over the previous versions.

This will help us to save some times once s/4 HANA 1909 is released.

Thanks