5. Trailers so far

Up until now, 3 trailers were released: two back in October 2014, and one on January 12th. Watch them and refresh your memory:

Official teaser trailer released on October 22nd, 2014:

Special look released on October 28th, 2014:

Latest trailer released on January 12th, 2015:

Bonus: Ultron "“ a sentient machine with an Oedipus complex

Ultron envisages an evolutionary program he can materialize only by bringing organic life to an end. This form of "justice" is driven by a sort of Oedipus complex conveyed in the words of Pinocchio: Ultron recites No Strings On Me, as if to reaffirm his autonomy and independence from creator Tony Stark.

So, there you are. This is the list of must-knows. Chances are information will continue to pile up until May 1st. Stay tuned, we'll keep you posted.