The Dictionaries blocks documentation includes all of the blocks and also includes an example of using the list by walking key path block to walk the new XML structure.
The Web component documentation includes the three new functions JsonObjectEncode, JsonTextDecodeWithDictionaries, and XMLTextDecodeAsDictionary with some discussion of the output they produce.
This document in the Technical and other guides reference materials describes how to use the dictionary blocks in conjunction with JSON-based Web APIs.
I also wrote this memo (which I think I had shared with the power users) that discusses specifically the redesign of the XML parser output.
With all of the documentation, I’m happy to incorporate any suggestions to improve the materials with clarifications or examples. Where possible, I’ve tried to put links between documentation pages to aid with follow-up research. If you think that there should be links someplace in the docs, please let me know.