I noticed the Arch Linux ipython package is out of date, at v5.3.
It looks like it was first flagged almost 6 months ago when the 6.0 release hit. Since then, there have been multiple releases on both the 5.x and 6.x branches. The current versions are 6.2.1 & 5.5.
I emailed the maintainer Kyle Keen two weeks ago, but have not received any response.