I watched the trailer with the knowledge of said rumors... Trailer looks great but why does every trailer theme have that emotional piano motif?
Anyway, watching this with the rumors in mind, it only confirms for me that there is indeed a time travel plot, which I think is the laziest thing, and then..
Spoiler
a contrived sidekick character, Indy meeting his younger self which the trailer shows said younger self (but that could be a flashback, but all points to the time travel plot, which I think is lazy and uninspired), and, interestingly enough, based on the rumors, Mads Mikkelsen is supposed to play a younger version of Toht, which raises eyebrows for me on whether that's true or not... But the most offending rumor is younger Indy sacrificing himself and present Indy fading away and passing the whip and hat to contrived sidekick character...
My only response to the trailer while watching it was simply "ohhhhh noooo..."
Also does not help when test screenings have also been extremely negative consistently.