According to a report over at Fudzilla.com, the new Nvidia Geforce GTX 780 should launch on 23rd of May. Nvidia AIB partners will also come up with custom and factory-overclocked cards but those should come a few weeks later.
In case you missed it, the GTX 780 will be based on GK110 chip, the same one behind the GTX Titan graphics card and according to earlier rumors, the GTX 780 could be considered as the Titan LE. Most partners will launch reference cards and according to the same report, we should see them available from day one.

Since GTX 780 comes with, what appears to be a same cooler as on the GTX Titan, most partners are expected to use it and only a selected few might decided to go for a custom cooling solution.

The reference GTX 780 should sell at around €500, while factory-overclocked ones should go for around €600, but those will also depend on the region.

In any case we'll know for sure on 23rd of May.

Source: Fudzilla.com.