There is a movie describing the changes and the reasons on myboeingfleet.com, unfortunately the file size is 176mb zipped. Flt ops management would do well to download and show all pilots what it is about. 737newnormalprocedures.zip is the file.
The changes cover all Seattle produced airplanes according to the movie and are included in the latest FCOM of both NG & Classic 737.
The main theme is safety, only item to check whilst taxying is the flaps and similar minimal checks for approach.
To reduce ground (runway incursion) and landing incidents by allowing more time to look outside It would seem.
Hope this helps