1. Beyond Good & Evil 2
Beyond Good & Evil was one of the many games kicked out in the early years of the 2,000's which was part of planned series. Unfortunately, while it won a lot of critical acclaim it wasn't a huge commercial success and the status of its sequel was thrown into doubt. The game has since garnered a huge cult following that has helped keep hopes for a sequel alive; while it doesn't sound like it's been shelved completely, Ubisoft Montpellier announced they were taking a break in 2011 to work on Rayman Origins. Since then, it's been confirmed for this console gen, but there's no word about an arrival date.