Campaign weekend "Vidar's Fate" is coming to Warhammer World, and take a look a tthe advertisement for it. The event itself is pic on the left for June 22nd and 23rd, and clearly shows artwork for Genestealer Cults. The initial observation is that Games Workshop is not avoiding the use of artwork showing Genestealer cults, and even perhaps some of the story behind them.
If this is the case, perhaps when Tyranids get developed more we will see the return of Genestealer Cults and some sort of allies for the tyranids. There are also rumors of an allies supplement.
A thanks to Flynn and Daniel (from http://paintstationforge.blogspot.co.uk/) for the pics.