I'm not sure Early Access on Xbox will work exactly the same way.
I expect MS to have a tighter leash on titles going through their early access program.
The downside is that I would also expect less titles to get the go-ahead. Partly because PC is a better fit for early access so there will be more titles in the pipeline, and partly because even though MS is clearly opening up the walled garden it's never going to be as open as PC.