In the download area you will find images for the 4K boxes with preinstalled Kodi 18.6.Feed is as before that from the 4.0.X images. You can install plugins as before, there could only be problems if plugins install gstreamer modules because they have installed gstreamer 1.16.
Amazon doesn't run, Netflix and Disney more or less - Kodi on a Vu is a crutch and remains a crutch (everything has to be decoded / encoded in software without hardware support).
According to the current status, Kodi will never make it into the image - it remains open whether the team will invest a lot of time because there are much more potent solutions for less than 40 €, ¬ (e.g. Firestick).
Have fun testing