What kinda TV is this?
 

http://i.imgur.com/vXeKjN8.jpg

The aspect ratio looks a lot wider than normal....

It's an Ultra Wide UHDTV (4 or 5k) can't see the brand in the picture

Ultrawide, i have two 34" computer monitors like that. 21:9 ratio, great for movies.

Interesting - Being totally honest, I'd never hear of the Ultra Wide variant on a TV...

So if you were watching a 1080p widescreen movie would it stretch it or have two 'letterbox' stripes on either side? Like my UHD4K does when watching an old show not shot in widescreen?

Philips has these. Search for "Cinema 21:9 Platinum Series Smart LED"