AMD has allegedly delayed their upcoming flagship dual GPU based on the Fiji silicon dubbed "Gemini" to Q2 2016. Earlier this year, during an E3 livecast, Lisa Su (AMD CEO) had committed to a release date of Christmas 2015. When questioned by hardware.fr about the delay, AMD claims it has been pushed back because the HMD (head mounted display) ecosystem isn't quite ready yet and therefore they opted to hold off on Gemini's release until Q2 2016.
However, this does bring into question whether Gemini will even be relevant in Q2 2016 as AMD is also scheduled to begin release of it's much anticipated next generation Greenland GPU during that time frame.
Edited for corrections.