LyX 2.1.5 is the the final release in the 2.1.x series. In this release were fixed a number of bugs and made a number of improvements. Many of these were minor, but there were a few crashes fixed. All these changes are detailed in the announcement http://www.lyx.org/announce/2_1_5.txt.
One of the main features of 2.1.5 is its ability to read and write files in the 2.2.x format. Since the conversion process back and forth usually will not leave one with an identical file, however, it is not recommend attempting to collaborate with users of 2.2.x.
Since the end of support for Fedora 22 is near this will be the last available LyX version. If you intend to use LyX 2.2 we encourage you to upgrade to Fedora 23 or 24 where lyx-2.2.0 is available in the stable repositories.
Updates may require up to 24 hours to propagate to mirrors. If the following command doesn't work, please retry later:
sudo dnf upgrade --refresh --advisory=FEDORA-2016-13f1ce3950
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This update has been submitted for testing by jamatos.
This update has been pushed to testing.
This update has reached 7 days in testing and can be pushed to stable now if the maintainer wishes
This update has been submitted for stable by jamatos.
This update has been pushed to stable.