Read the official Contao announcements.
Contao 3.5.0 is available
by Leo Feyer
Contao version 3.5.0 is available. 111 tickets and pull requests have been completed during the 4 months of development and the following testing period.
Overview of the changes
The new features in Contao 3.5 have been described in the previous announcements of the beta and RC versions. If you have not followed the development process, it is recommended that you read them.
Long term support
Contao 3.5 is an LTS version, which is supported at least until November 2016. It supersedes the current LTS version Contao 3.2, which now enters its 6 months transition phase during which only security related issues will still be fixed.
What to keep in mind when updating?
As always when updating, you should create a backup of the files and the database. Especially when you are switching from Contao 2 to Contao 3!
Developer information is available in the