Speaking from England here, but my local shop is saying they have them on their website.
And, strangely, they are selling the 3 for £4
cheaper than the 2 (with the TU-2 being £79 and the TU-3 being £75 for the record).
Not quite sure why, haven't had a chance to try out a 3 yet. I'm guessing the popularity for the 2 must still be quite high but it still seems very strange. I know the new one has a greater accuracy bringing it level with the Pitchblack (+/- 1 cent) but the Boss isn't true bypass. Suppose it depends if you want a buffer at the start of your chain or not as to which one you get (not saying that's the only reason however!).
I'd still like to try one out but they don't have them in yet...Actually, just checked and they are showing 'NEW In Stock' so I might get the chance. Will report back if I can

Hope this helps OP
