9087 said:
Bungie has not even shown DESTINY running on XB1 yet. Everything they've shown has been running on PS4.
It's also very possible that Sony will have an exclusive DESTINY bundle when the game is released. This would be HUGE and would be Sony's best way to counter the inevitable Titanfall bundle that MS will have.

This is probably the most underrated pick up for either company. It would be like MS getting Naughty Dogs next big IP on their console, with exclusive content and marketing (would never happen since Sony owns ND, but you get the point)
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If you truly belive they where showing in real PS4 retail unities...
You are clearly overestimating this issue. Destiny were to be a Xbox timed exclusive because Bungie didn´t had the man power/money to port the game to 4 (or 5 or 6) platforms at the same time. It´s clear that Activision brought up its tradition of porting the game for the broadest user base possible.
The cross generation debacle we are seing this month. The performance and bugs of CoD, AC4, Watchdogs and even Battlefield 4 shows how dificult it might be to achieve a outtanding performance when you have so many versions to delivere in so little time.