What's all this talk about Peter Weyland?!

I've been a member of this forum since December and between then and now, have had internet on and off. I try to keep current with all the new discussions, theories, etc but one day after not being on for a week or so, all of a sudden everyone is talking about Weyland stowing away on the ship and he's old and blah blah blah. I've tried very hard to find where this rumor originated in the discussions but wasn't able to pinpoint: 1- where this idea first came from and 2- what evidence makes folks so sure that this is a theory that is most likely true. At first I just thought it was a discussion but so many threads have mentioned it so I have to ask because I apparently missed out on something big lol The last interviews I read with Guy Pearce states that he has a small role in the film, he was on set for not even a month and didn't even get to meet everyone in cast/crew. But, like I said, there seem to be a following of people who believe he his on the ship and plays a larger role... and then that latest scene by scene "recollection" of the screener. I just want to know if there is legit evidence or if this is just wild speculation lol