They're not ready yet, Kopin is aiming for the end of this year:
"This OLED deposition line is expected to be ready for volume production by the end of 2017, enabling Kopin to meet the near-term customer demand for its consumer OLED micro-displays"
BTW, you're talking about 2.5k, but these screens are actually 2k*2k per eye, so effectively 4k total.
And this will even take (way) longer. BOE VR is going to build a factory together with Kopin. The factory should be ready in 2 years (!) after which mass production of these screens can start (see link above)
"our expectation that the new facility will be built on a 20 acres parcel of land in Kunming, Yunnan Province, China;our belief that the facility will be the world’s largest OLED on Si manufacturing center; our expectation that the facility will be completed within two years;"
I'm betting/hoping Samsung is going to be ready in 2-3 months for mass production of 4k OLED, so just before Kopin. Either way, we're looking at end of 2017/beginning 2018 for 4k OLED VR. Then Pimax just needs to put 2 of these panels in their Pimax 8K+ and we're ready for some serious VR