Terry's right that there's hardly any point speculating on analysis of modern tone hole spacing and bore. At 35,000 years old it's unlikely to be octotonic anyway (i.e. there are other examples of ditonic, tritonic, tetratonic scales etc). If you read the article they have a pretty much complete reconstruction so there isn't a huge amount of guessing to do.
8mm bore
22cm long (adding a bit at the bottom based on average vulture's arm length)
5 tone holes, based on precise measurement marks (the break is at the 5th hole)
Two deep, V-shaped notches were also carved into one end, which was presumably where its maker blew into... but he thinks that blowing into the instrument (without any additional mouthpiece) would have been enough.
I guess either reed or end blown whistle is possible. The V-shaped notches (if not completely covered by the lips) would allow for a bladed whistle arrangement. The fact there are two on the same end might suggest a reed or other fitting, but I'm no archaeologist so just idle speculation.
Who's first up with their 8mm PVC replica sound posting? (guess this should be on the whistle thread)