that IGN listener sounds like the kinda stupid fanboy that should never be allowed any where NEAR a PC's word editor. god knows what kinda BS fanfic they've created.
if Vision were to appear - which wouldn't be until a sequel at least - it would either be as a Pym-built android or an adaptation of Ultimate Vision - an alien construct.
as for shooting, according to a bit on Newsarama, Joe Q said it started shooting in March and according to stuff from December, prinicpal photography starts in April to run until September. that's according to stuff cited on the Avengers (2012 movie) page on wikipedia