We are expecting to have more available mid-late next week. As a general note, we're working really hard to stabilize our inventory levels and should hopefully be able to by mid November on most products.
The biggest difference is with the landing struts and compatibility. Mark 1: Works with 10179/75192 (landing struts must be removed), Mark 2: Works with 75192 (landing struts can remain stay on).
Hope I answered some of your questions! Feel free to post more, and I'll do my best to answer them all! :)