The following light novel publishers became internal (in-house)
brand companies of the Kadokawa Corporation starting from October 1, 2013:
ASCII Media Works
Enterbrain
Fujimi Shobo
Kadokawa Shoten
Media Factory
Starting from October 1, 2013, the
publishers' names will be "Kadokawa/publisher name", so the new names of the above publishers are:
Kadokawa/ASCII Media Works
Kadokawa/Enterbrain
Kadokawa/Fujimi Shobo
Kadokawa/Kadokawa Shoten
Kadokawa/Media Factory
I'm not sure why they couldn't just keep the names of the publishers as they are even though they have been incorporated into one company. Anyway, the above publishers will be added to the main site asap. Any new light novel volume published on or after October 1st, 2013 by one of the above company brands should have the publisher name as mentioned above.
In the not so far future the user will be able to pick author/illustrator/publisher/label per light novel volume, and this is only when there are multiple authors/illustrators/publishers/labels mentioned in the light novel series' info, otherwise there's no need to add such data per volume (since this data will be automatically inherited from the light novel series' info).
Edit:
Ok, though the above seems to be true on at least online stores:
http://www.amazon.co.jp/dp/4047293989 (Kadokawa/Enterbrain)
http://bookwalker.jp/dec7563c09-5798-4cb5-81d1-1ab245514f3a/ (Kadokawa/Enterbrain)
http://www.7netshopping.jp/books/detail/-/accd/1106366766 (Kadokawa (Enterbrain))
But on the official site, the publisher's name is too long:
http://www.enterbrain.co.jp/corporate/profile_e.html
Maybe the incorporation of these companies into one, and their name change should only be mentioned in the publisher's info (once this possibility is added), but for now their English names are staying as they are.