I think it was mentioned somewhere that the unlocked I5 was going to be around 270 Dollards and I7 just tad bit under 400 Dollards, which granted are a bit higher than 4690k and 4790k.. still somewhat decent though. What really is going to be the most crucial is price of the motherboards and DDR4, if they go down so that the new setup is only ~100 Dollards more, it's somewhat acceptable if the power increase is also there.
In the end it comes down to if we get another generation of non-upgrades.. or if we get some actual performance increases.