It has been licensed.
There will probably be no more fan translations by next year and the official translations will be on sale.
https://www.reddit.com/r/LightNovels/comments/3ob3uo/translated_overlord_light_novel_all_current/
Here are the current epub versions of anyone interested and have a good read!
Usual official releases of volumes are 3-4 per year and there are currently has 9 volumes released and still ongoing