As much as one willing to pay for them, just like any other domain name.
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If you are asking the registration price than its depends on the registrar but average price is USD 17 per year. But if you are asking the value of .asia domain than it depends on the domain name and nature of business. Like mp3.asia is one of the best domain name.
depends on how well .asia is promoted and adopted.. Right now, only a few names are worth decent price as buyers are willing to pay.. I think the extensions are getting toooooooo many tooooo soon.. I don't even see the need for a .asia extension.. outright silly IMHO..