Ok, so just the Buzz controllers and Move. That's my recollection, too. Sony don't sell guitar controllers so support is on the the manufacturers or game developers. Ditto, I think it's fair to say, including adaptors. Something not being technically impossible both additional hardware is not a sign of Sony being pro-cross-platform compatibility. But that measure Sony support use of 360 controllers.
But I guess why it's so, peripherals are a licence to print money. The DualShock 4 has got to be about 70-80% lovely juicy gravy-flavoured profit!