Apologies if this has been discussed already on the forums; I did a quick search but it seems to have gone unnoticed.
Alduin is clearly spotted in two trailers for the PS4.
http://www.youtube.com/watch?v=QOdW1OuZ1U0 Here he is clear as anything, hovering in the sky at the end of the trailer. Look at the way he flies, the horns on his head, his black spikes, etc. It is undeniably Alduin.
http://www.youtube.com/watch?v=7dR28fXFDMI In this trailer he is less obvious, but still not exactly sly as such. From 0:22 onwards, you can clearly see him poke his head around a corner.
Why exactly is Alduin in two PS4 trailers? Could this be a hint at a next gen reboot of Skyrim?
(I was going to ask if you also thought it was Alduin, but that really isn't even up for debate)