I don't know why Dale releasing such internals constantly. Developer will be unhappy that their game reveal is spoiled and it adds nothing to the Switch discussion.
And if its only a slightly changed UE4 tech demo its another proof that Dale should get their sources right.
If a few blurry pics add "nothing to the Switch discussion," then there is nothing to spoil. Also, if the devs were worried about spoilers, then they likely wouldn't reveal their trailer to a journalist - who is known for leaking Switch details - at this time. The way this stuff usually works is that the journalist gets a green light from the source on what they can/can't tease. Otherwise, they'd effectively burn bridges, and lose valuable 'insiders'.