The GTX 275 should launch on April 2nd and the cards should be available directly on the launch day, or worst case scenario the next day.
There is a big rumour that Nvidia plans to release a limited
number of cards and that this product is there simply to mess up Radeon HD
4890. We can confirmed that Nvidia plans to fight and sink Radeon 4890 sales, but
we are not sure about the number of the cards.
GTX 275 should be selling for about €250 suggested etail
price in Europe while the overclocked cards will get at least €20+ more
expensive. The big problem of GTX 275 is that it will sit too close to GTX 285
price-wise, but in the end the market will decide.