MediaWiki 1.26 will be released later this year. There are 62 open tasks in Phabricator tagged with "MW-1.26-release".
Some tasks miss an assignee; some tasks welcome patch review. Dropping some links here to raise awareness and ask for help:
12 without any assignee and without a "Patch-For-Review": https://phabricator.wikimedia.org/maniphest/query/MoC9YKZ4gsR./#R
48 with "Patch-For-Review": https://phabricator.wikimedia.org/maniphest/query/w6gwbg0JIWRl/#R
23 with Assignees set (Aaron, Addshore, Bawolff, bd808, Catrope, Cenarium, Dchan, Gilles, Jdlrobson, Hexmode, Legoktm, Matmarex, Seb35, Sn1per, Tgr, Ċ½eljko): https://phabricator.wikimedia.org/maniphest/query/KWoEsNbaAjFX/#R
andre