This card tracks a proposal that's currently part of the Community Wishlist Survey: https://meta.wikimedia.org/wiki/2015_Community_Wishlist_Survey
The Wishlist Survey voting phase lasts until Dec 14th. After the voting has concluded, the top proposals will form the backlog for the Community Tech team to investigate and address.
See also T97672: Allow exporting MediaWiki pages in EPUB format, which may overlap/duplicate.
There used to be a tool that enabled the conversion of Wikipedia articles into EPUB files. This functionality has been disrupted because the partnership between Wikimedia and PediaPress ended up. I wish the TechTeam could work on a new EPUB converting tool.
--Kimdime (talk) 10:53, 10 November 2015 (UTC)