This release contains a number of new features as well as some bug fixes, especially for edge cases.
Please see 1.4.2...1.5.0 for a full list of all the changes.
A list of tickets/PRs fixed/merged into this release since the last 1.4 release can be found here:
https://github.com/FriendsOfSymfony/FOSRestBundle/issues?q=milestone%3A1.5.0+is%3Aclosed
Starting with this release the documentation is best read on symfony.com:
http://symfony.com/doc/master/bundles/FOSRestBundle/index.html