According to the latest news the Joomla! 3.4 is almost ready and will be released in February.
Release date has been revised because the Joomla Team wants to make sure that everything is tested and complant with the relevant quality.
10th February was the date of the Beta 3 release. On 17th February comes the Release Candidate (RC) and then finally on 24 February 2015 arrives the 3.4 version.
The new Joomla version brings many new features and resolved issues.
Complete info about new features you can find here.