[RPG] For the 5th edition, what Eberron-like official settings exist

Well, if we're only counting the WotC ones, in no particular order:

• Dark Sun -- 3.x material in Dragon and Dungeon, and of course it just came out for 4e.
• Eberron -- winner of the setting search, by Keith Baker. Got a lot of WotC support.
• Forgotten Realms -- the biggest one, probably.
• Ghostwalk -- one book, interesting setting about undead.
• Greyhawk -- lightly supported by WotC, but don't forget that WotC's organized play was mostly about Greyhawk!
• Mahasarpa -- Web only, Southeast Asia flavored.
• Nentir Vale (aka Points of Light) -- the default 4e setting.
• Planescape -- got mostly magazine support from WotC. Built into the 4e generic setting.
• Ravenloft -- will be an official 4e setting next year, I think.
• Rokugan -- yeah, Legends of the Five Rings. WotC published a version of Oriental Adventures using the setting, though.
• Spelljammer -- showed up in Dungeon magazine once or twice.
• Mystara - Basic D&D "Known World" -- Showed up at least in the 30th anniversary Dragon mag and maybe a few others.

Settings introduced for 5th Edition:

• Ravnica -- a Magic the Gathering setting published in Guildmaster's Guide to Ravnica
• Wildemount, in the world of Exandria -- The setting of Critical Role: Campaign 2, published in Explorer's Guide to Wildemount
• Theros -- a Magic the Gathering setting published in Mythic Odysseys of Theros

TSR ones also include:

• Blackmoor - The Original setting, different from the "Blackmoor" in Mystara
• Al-Qadim - Arabian knights
• Birthright - PCs rule countries
• Council of Wyrms - dragon PCs
• Dragonlance - based on the novels
• Jakandor - island mini-setting
• Pelinore - from Imagine magazine

I'm not counting the various subregions of the Forgotten Realms, like Maztica. I'm also not listing all the third party settings. Lots of those!

A full list can also be found on Wikipedia.

Home Campaign is code for "everything goes".

All the other options are supposed to limit choices to ones either permitted (as Lair Assault and Encounters seasons may have regulation determining selection options) or suggested (Dragonmarks do not appear in canon Forgotten Realms).

The only mechanical impact that I can see for selecting the Eberron setting, is that the background options are limited. For example, Forgotten Realms Player's Guide backgrounds do not appear as options (though Neverwinter ones do).

I would have expected that setting specific themes, such as the Dark Sun ones, classes such as the Bladesinger, deity choices such as Pelor, and a more complete set of setting specific backgrounds (such as the aforementioned Neverwinter ones) would also have been restricted, but it appears not.