According to what the Release team told me, wubi.exe appears on the images. Whether or not this means it's "supported" is open to debate among the ops, however, for all other intents and purposes, wubi.exe is only "community supported" and not really maintained by the release team.

However, they did say it's on the ISOs. It doesn't work with Windows 8, nor UEFI, but they have it there as "available" but by default "disabled" as far as I can tell.

How do we want to handle Wubi, now?