Not so much for the autotuning, although I do have an EP of autotuned theremin pieces with my record company waiting to be released. (Sample track - http://youtu.be/RkRc7b4jhfo )
I'm excited about the sound set it offers. I have a copy of Animoog for iPad, from which the audio engine for the theremini is derived, and it's rather good, and not at all theremin-like, which means it will not be duplicating any of the theremins I already own. Also the scalable pitch field and the possibility of good linearity that going digital offers.
(BTW - Animoog for iPhone and iPod Touch is currently free, if anyone wants to grab a copy.)
Here, for the sake of making a positive contribution to this thread, are my thoughts on autotuning that I posted recently on facebook.
This is what is wrong with autotuning a theremin (for a classical thereminist) - the pitch field is unpredictable enough already, with pitch correction on you lose the direct correlation between hand position and pitch that you rely on. Say you are playing a C. You do not know if you are 49 cents sharp or 49 cents flat, because it sounds in tune. So a tiny movement could abruptly and unexpectedly cause the instrument to jump to a different note if you are unknowingly close to the boundary between two notes. (Or will pitch preview be uncorrected? Being out of tune would sound awful, hearing both the untuned preview and the corrected pitch through the amp. My guess is you wouldn't be able to tell if you were sharp or flat.)
There are other ways to provide audible pitch assistance to a thereminist using pitch preview - for instance, one idea would be to make pitch preview stereo on headphones, and relate the pitch accuracy to the position of the sound in the stereo field, so (for a right handed player) very flat notes would be heard in the left channel, and very sharp notes in the right channel, with on-pitch notes being in the centre. I haven't tried this (I don't believe anyone has) but it seems to me like it would be worth trying, if playing in tune is your thing and you want training-wheels.