My phone did an update today, I now have Lumia Denim. I apparently have Cortana but can't use it, clicking on it tells me Sorry I don't speak your language yet.
Where does it think I am Outer Mongolia
Digging around a bit and it apparently needs a download, I don't know which one or where from so will wait and see what happens and if I can find anything else out.
I am very impressed saying I have the first entry level phone, a Lumia 520 that ran Windows 8 when I got it getting on for 2 years ago. It's gone through upgrades to 8.1, Lumia Black, Lumia Cyan and now Lumia Denim, don't think I've missed one out.
I love my Windows Phone and will definitely go with another one when I'm able to upgrade in April.