Here's another article that might be of interest to some Insiders.
There are a couple of interesting points copied below in case you don't want to read the entire article.
"Marriott hotel owners don’t have to offer the same rooms or inventory to Expedia as they would to Marriott’s own direct channels, and Marriott and its owners continue to be able to offer special room rates and offers for Marriott Bonvoy loyalty members."
That could be interesting. Booking at Marriott might mean getting access to better rooms and/or rates.
"... estimated that Expedia bookings likely account for 'low single digits of total Marriott bookings' and that, conversely, Expedia gets approximately the same in terms of bookings from Marriott."
The one thing I didn't see was any mention that folks who book with Expedia will get any elite benefits or recognition. I suspect that part will likely not change. I guess we'll see.