User blog comment:Commander Marko/What's Riot really up to?/@comment-4652200-20130815002950

First off they've decided to release only 10 champion per year from now on, but Lucian is delayed even more due to "bugs".

Secondly they've stated that Cho is a low priority VU, which would indicate they are not up to a major faction update about the Void. Xerath or Yorick will probably be the next to have relaunch after Heim.

My guess is they just got "technical difficulties"/a lot of rioters are on vacation during the summer.