Sony has announced that they're delaying the European release of Little Big Planet 3 by a week in order to avoid clashing against the other big titles out at the same time. It'll now release on November 26th in Europe, 28th in the UK. The North American release is unaffected.
With Far Cry 4 and Dragon Age: Inquisition (as well as Project: Cars) all hitting the same week, we can see why Sony have shifted slightly in order "to give Sackboy the best opportunity to shine", as reads the announcement post on the official EU PS Blog.