I don't quite get the hardware thing though. From the blurb, all sonics are contained in Omnsiphere, and the hardware appears to be a remote control. So visual feedback will presumably be a major issue - it won't always be obvious what you're controlling and plenty that you can't control, I'd have thought?
Unless I'm missing a trick there (and I might be)*, I'm far more interested in the doubled voice architecture, filters and new synth sounds and sources. This is the section that has my attention:
Expanded Synthesis Capabilities
The new version 2.5 vastly expands the synthesis capabilities of Omnisphere by doubling Omnisphere's voice architecture to Four Layers per patch. Each patch can now utilize up to 12 envelopes, 8 LFOs and the Modulation Matrix has been doubled to 48 modulation routings. Newly designed State Variable Filters are included, which were specially created for the OB-6 hardware profile and can seamlessly blend between lowpass, notch and hipass filter modes. Over 50 New "Analog" Oscillator Wavetables are included and featured in the new hardware profiles.
New Hardware Sound Library
Omnisphere 2.5 includes a new "Hardware Library" with hundreds of new patches created by Eric Persing and the Spectrasonics Sound Development team using the Hardware Synth Integration feature. Each hardware profile has a corresponding set of sounds in the Hardware Library which were specially designed using that hardware synth as an Omnisphere controller. The new sounds feature a wide range of categories and many have a distinctly 'classic analog' flavor. Best of all, the new sounds are available for ALL users, regardless of if they use hardware or not.
*EDIT LATER ON 3rd MAY - I was indeed. As became clear, the hardware control is not a way to control all of Omni, but instead an alternate synth for each hardware model. And looks deeply, deeply cool.