Dutch webshop MaxICT has listed the Intel Core i7-4770K for preorder. The listing doesn't say much, except that the CPU is delivered in a tray (not a boxed version), and that it has a clock speed of 3.5 GHz. The listing was already spotted earlier, but now it includes a release date.
The listing states that the chip is expected to ship on May 31, 2013, just a couple of weeks from now. The price for the CPU is listed at €331.13. In comparison, the i7-3770K (boxed) costs €302.32 from the same website. Both prices are including 21-percent VAT for Dutch residents. This would mean that the price of the i7-4770K in the US could be anywhere from $331.13 to $430.00, although it will probably be priced closer to the former, and slightly higher than its predecessor, the Core i7-3770K.