http://www.avid.com/US/products/Pro-Tools-Software/
What’s new
Speed up editing and mixing with Clip Gain, and easily adjust and match gain levels, pre-mixer
Use multiple audio formats in a session—including interleave—without file duplication
Record and master higher resolution sound with more headroom in 32-bit floating-point format
Get great responsiveness on slower hard drives with the enhanced disk handler
Record in low-latency mode, with direct monitoring when using third-party audio interfaces
Get the sound of System 5 console EQ and dynamics with the Avid Channel Strip plug-in
Get access to over 500 additional Pro Tools commands when using EUCON controllers (watch the video)
Work more easily with AudioSuite-rendered clips with reverse processing, handles, and more (watch the video)
Create extra long-format projects for sequential versioning with the extended 24-hour timeline
Open fade-heavy sessions faster and get better responsiveness with real-time fades
Export mixes directly to SoundCloud to share and promote your music to the world
+ the AAX format plugin and new HDX card.
DEFINITELY not worth being a full number upgrade. If the DAW would've finally been 64-bit, then it would've been a major upgrade. But it's not. Also wtf with the clip gain being advertised as the major groundbreaking new feature? That functionality has been in almost similar way in Cubase since... pretty much forever? And only one new bundled plugin?