ImpressCMS 1.3.8 contains bugfixes, backported code from ImpressCMS 2.0 development and updated external libraries.
It is a release that was created on 21/07, but it just made it's way out of the door right now. This is also the first release that will be made from Github.
Downloads and more information can be found directly on the Github release page
On a side-note, expect a new alpha release for ImpressCMS 2.0 by the end of the week, Mekdrop has been doing some fantastic work recently that we want to present to all of you. But that's another subject of course.