Probably very few, however I would imagine the success of this project now depends largely on people that have had exposure to the PR and are either in two minds as to whether to pledge or are simply planning to pledge last minute. Can only speak for myself, but despite being aware about the project since before the kickstarter launched, I didn't get around to pledging until today. Indeed, I probably would have left it until the last or failed to pledge at all solely because the perceived chance of the project succeeding seemed (and indeed seems) quite low (this is despite knowing full well there is no financial risk involved in pledging..). I reckon this chance of succeeding probably informs people's decisions more than is perhaps logical - if the target looks achievable with a few days to go it might well swing others to pledge, if the opposite is true pledging may well be seen as futile.