According to Collider, folks attending specific IMAX midnight shows of Prometheus might score themselves this limited edition poster! Here's hoping Singapore will play the same game (although I'm not able to attend a midnight showing in the first place, on account of my 'condition' lol).
"Exclusively for IMAX fans – those attending the Prometheus midnight shows in North America in the first hours of June 8th receive an exclusive, limited edition poster. The never-before-seen artwork teases the mysteries unlocked in Prometheus, and is available as part of IMAX 12:01. Check for list of participating theatres on imax.com; while supplies last."