From http://www.icann.org/en/topics/new-gtlds/factsheet-new-gtld-...

> How much is the evaluation fee?

The evaluation fee is estimated at US$185,000. Applicants will be required to pay a US$5,000 deposit fee per requested application slot when registering. The US$5,000 will be credited against the evaluation fee

> Are there any additional costs I should be aware of in applying for a new gTLD?

Yes. Applicants may be required to pay additional fees in certain cases where specialized process steps are applicable, and should expect to account for their own business startup costs. See Section 1.5.2 of the Applicant Guidebook.

And the guidebook (http://www.icann.org/en/topics/new-gtlds/rfp-clean-30may11-e...) mentions a number of different fees.