John Carmack doesn’t mince words. The legendary developer, who for several years held the role of Oculus CTO but now maintains a less formal “consulting CTO” arrangement, says that his keynote presentation at last year’s Facebook Connect conference foreshadowed some of the announcements that can be expected at the event next week. But the announcements won’t come without some personal reservations as “many of the challenges and pain points for me still remain unresolved,” he says.