A lot of people have been asking about the price, so: The price of the game on both Steam and PSN will be $39.99 / 36.99 / £29.99.
Pre-orders:
A lot of people have been asking about preorders too. Preorders will go live on Steam and the Humble Store (and on this web site) today at noon PST. Unfortunately we wont have preorders on PSN, because apparently developers have to set those up months in advance and we didnt know that!
The preorders are regular price! They contain an amazing bonus pack-in: the warm fuzzy feeling that you have pre-ordered the game. (And thats all). So its exactly the same as buying the game at launch, except earlier.
http://the-witness.net/news/2016/01/price-and-pre-orders/
Modedit: some context regarding the price:
Theres a lot here. When we started making this game, I figured it would have between 8 and 12 hours of playtime. As it happens, the game weve finally built is around 10 times as big as that: if you are a completionist who wants to wring every last drop out of the game, you might expect to play for 80 hours, or possibly 100. For people who dont want to go quite that far, the games still got plenty for you.
http://blog.us.playstation.com/2015/09/17/the-witness-launches-on-ps4-january-26-2016/