There has not been any talk about the return of Eldrazi. Last we saw them, Ulamog and Kozilek had been obliterated on Zendikar by the giant Gatewatch Channel-Fireball, and Emrakul was sealed into Innistrad's moon. With all three titans handled, things should revert to how they were pre-Rize of the Eldrazi, where there are no Eldrazi roaming the Blind Eternities at all, or at most they'll show up on the plane the Titan(s) is sealed on, which in this case would be Innistrad.
Innistrad is still one of Magic's most popular settings so I imagine we'll return there again in the near future (probably another 1-2 years), but they wouldn't necessarily want to tug on that Eldrazi thread again so soon. A lot of people complained that they took Innistrad and Eldrazi'd up the place.