A list of the specs is over on the SoundCloud page but some standouts would be:
 96kHz audio processing with 32x oversampled oscillators so aliasing is all but nonexistent. Ten oscillators are available per voice (20 in dual mode).
 No loss of polyphony when you add hypersaw, effects etc (in stark comparison to Virus, even the TI2 where I found getting much over 16-18 note poly was a struggle with the sort of sounds I liked). With the single exception of dual mode (2 voices per note) Valkyrie is always 128 note poly regardless of settings.
 4096 looped wavetables (vs. 64 on Virus), 32x oversampled
 A UAC2 USB 2.0 implementation with 8 stereo 96k/24bit streams to your DAW
I hope to have some demos to back the specs up very soon, development only finished a couple of weeks back.
If there are any features missing that anyone thinks are a 'must have' I'm happy to consider them. I will be adding 4-pole filters in a future update.