They've already started advertising the new price aggressively in the Netherlands, showing some games and a voice saying:
- "Did you know the Xbox One is the only console on which you can play the top 10 games of 2015?"
- "And on which you can also play your Xbox 360 games?"
- "Oh, and it's also only € 299 now, maybe I should have started with that"
- "Now € 299 at these retailers"
Don't know if the price at these retailers was already € 299 before and if the ad may have been airing before today, but I hadn't seen it yet, so it might be new.
Edit: hmm at most stores you can get it for less even, or € 299 with a game, but the ad may be new now that it's an official price cut.