GTLDs Will you buy one? - Web Hosting Talk
I'd expect the cost to be pretty high for most. Given the $185k fee just for application, not to mention the investment required in infrastructure to run it.
I don't think we'll see that many which are made generally available at low cost. More likely to be specifically targeted at certain markets, probably at the sort of pricing we see for .xxx potentially more. I'd also take a guess that a number would not even be made available for general registration - such as the ones Google applied for.
Source: http://www.webhostingtalk.com/showthread.php?t=1196683
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