They do fly after the 15th, we arrived on October 12th this year with easyjet. They keep the release date a secret and it's never the same - they have said to make it fair for all. But I think it was March this year that they released them, so there's no reason to expect it to happen any time soon.
It's a real pain if you want to get things sorted - I'm looking at flights from Manchester for £186 return, compared to £312 from Edinburgh. I also know if I get in early on EJ release morning I will probably get Edinburgh flights much cheaper than £186. The trouble is, if I don't, we're then 4 months on and the £186 Manchester flights will be long gone too...