Boeing Y1 - Wide or Narrow body?

[AirEngland]

As the title suggest, Boeing's Y1 or 797 whats the probability of the aircraft being a new widebody or a new narrow body. What will it replace?

I couldnt find the picture of boeings 767-300 with a top deck at the rear. I guess this aircraft would look rather cool, however what would its practicality be? Maybe for LCC's high density short/medium haul routes.

Lets hear your suggestions/thoughts on this.

[RLN]

AE, you keep asking sensible questions. It's too much for a befuddled old man like me.

[AirEngland]

We all have to get old lol. I'm just curious to what ppls thoughts are. I mean we can only speculate until the aircraft comes to frutition.

[RLN]

Well it's supposed to be a replacement for the 737, so I suppose it will be a narrow body short haul job.