[ArchWiki] Why isn't MediaWiki upgraded to 1.23?

[Dario Giovannetti <dariogiova@xxxxxxxxx>]

MediaWiki 1.23.0 (LTS) was released last June, and it's now at 1.23.5 
[1], however the ArchWiki is still using the legacy 1.22 version, and 
1.23 is being pushed to a separate "mw-1.23" branch [2]. Has the reason 
for this been discussed publicly, or can it be made public in this thread?

[1] http://www.mediawiki.org/wiki/MediaWiki_1.23#Release_schedule
[2] https://projects.archlinux.org/vhosts/wiki.archlinux.org.git/

Thank you