Microdisplay-expert (and personal friend) Karl Guttag posted an interesting article in which he delves deep into Magic Leap's patent filing and demonstrations to try and understand the technology used by the stealth AR startup that raised over $2 billion from Google and other companies.
While it seems that Magic Leap is developing several different technologies and perhaps even several devices based on different displays, Karl's conclusion is that an OLED Microdisplay is the most likely candidate for Magic Leap's demonstration unit (which may be different from the actual future commercial version).
Karl also says he acquired some shares in eMagin, even though there's no evidence that eMagin's displays are used by Magic Leap. Time will tell!
Disclosure: OLED-Info's editor also holds shares in eMagin