it surely makes a difference... If it wouldnt, companys wont need to make a NDA. E.g. think about apple and informations about new devices. They would do the same if a teaser about a future phone is leaked. Regardless if it will be sold in a week or a month. Thats normal business, because they want to get all attantion when it is officially announced. rumors can be good for devices, but to much rumor can be fatal for a new device
[...] the teaser was available what, three days on Youtube... more then enough time for everybody to wake up, hear about it, get home, look it up & watch it. two times over. do you really thing it would have taken NOKIA three days to get it off the air if they didn't want it there in the 1st place?