I don't know what it is, but it sure is a beauty! It might have some odontoglossum in there aswell.. It kinda reminds me of it (the spots do).. Meybe an oncidium/brassia/odontoglossum mix? But grabbing at straws here, I really dunno for sure .
I don't think so. Rhynchostele (thanks taxonomists) bictoniense has a very prominent, broad, spade-shaped lip, while yours is pointy, more like that of a brassia or ada.