Well, someone is very good at photoshop or Marvel forgot to say "April Fools" the tweet doesn't exist on their Twitter. Also, I wouldn't use that forum as a source. They have a tendency to get things wrong a lot and most of their information is over excited fanbased. I usually get my roleplaying face ideas from them.
ETA: It was proven to be an April Fools joke, here is the proper article link
Though it's upsetting to say the least, I'll only believe it when it's 100% confirmed. I mean, I understand that they tweeted it and everything, but again, it's a tiny tweet that tells us nothing.
Where is the article about this? Because this has been an ongoing rumor for the past couple of months and so far that's all it is, rumors. Last I heard (in this month's issue of Empire) it wasn't even a thought if he was coming back or not and it wasn't going to be a concern for a while now.
FUCK NO. Tell me this is another April fools joke like when yesterday there was a fake screenshot of Tom Hiddleston's twitter saying he wasn't going to do the Avengers 2. They can't ruin the franchise like this!