Check the new 5.3 release, a leap ahead of 5.2: http://ez.no/5.3
eZ Publish Platform 5.2 is the 3rd release of the 5 series, code-named Aconcagua. It is a Short Term Support (STS) release (5.3 will be the next Long Term Support release).
From the standpoint of Online Marketing and Customer Experience Management: 5.2 strengthens its core features, securing its position as rock-solid content-based Online Marketing platform with seamless integration of Marketing Automation, Smart Analytics, Personalisation and Recommendation, to name a few.
From the Technology perspective: in this version the New Stack, the part of the Dual Kernel architecture integrating Symfony2, should be the preferred choice when developing new sites.