I think Eberron will be a big experiment in Print-on-demand for Wizards. It's got all of the pieces in place to be a big hit with D&D gamers who dig Eberron - the original creator is driving it, so no arguments about Wizards "destroying the vision of the setting", it's got a sizeable fanbase, and it's a world that has the mission statement "if it's in D&D it can fit into Eberron somewhere" - meaning that all of the books that they sell are applicable for players who are using Eberron.
If sales on Eberron are poor, then Wizards knows that they shouldn't put much effort into other settings that don't line up quite nicely (Greyhawk is missing Gygax, so anything Wizards publishes as Greyhawk will always be contentious, for example). If sales on Eberron are good, then they can use that to leverage DM's Guild into a bigger publishing platform.
A lot of Wizards publishing schedule right now is to not overwhelm retailers - which was a problem with both 3e and 4e. If they can supply enough product to retailers while also giving niche products that the retailers can't have cluttering up the shelves a place to sell, it would be a solid win for all three groups (Wizards, the retailers and the customers).
If sales on Eberron are poor, then Wizards knows that they shouldn't put much effort into other settings that don't line up quite nicely (Greyhawk is missing Gygax, so anything Wizards publishes as Greyhawk will always be contentious, for example). If sales on Eberron are good, then they can use that to leverage DM's Guild into a bigger publishing platform.
A lot of Wizards publishing schedule right now is to not overwhelm retailers - which was a problem with both 3e and 4e. If they can supply enough product to retailers while also giving niche products that the retailers can't have cluttering up the shelves a place to sell, it would be a solid win for all three groups (Wizards, the retailers and the customers).