30,000 people are willing to "buy" this game 2+ years before it even gets released within just 10 hours of it's "announcement". There are still 31 days to go on the kickstarter campaign, and a lot of people who didn't watch Sony's E3 presentation yesterday are waking up to the news of this right now.

That means once the game is released, has an actual marketing/advertising budget, and word of mouth spreads, it's probably going to sell significantly more than that. They are also certainly going to port Shenmue 1 and 2, (since a lot of people will want to play the originals) so those should also sell reasonably well.