When you have a multi-million selling game and a new platform comes along, you don't tell the world you're definitely going to port it. You wait for the 6 figure check to arrive and then port it. If it's 7 figures, you call it a platform exclusive.
Money is the divider between words and actions.
http://www.develop-online.net/news/40013/Notch-gifts-3-milli...
Given his taken on money — and that Notch has taken a very public stance against participating in helping to close the PC — it is very unlikely that a fat cheque would result in a change of his actions. Time will tell, I suppose.