Because then he'd get the Canon reps angry. Perhaps even angry enough to cut him out of future preview playtime. Right now, he just plays dumb... "Guys, there's something important coming!" "Oh wait, i didn't say that. But it's still important
" "Ok, it's not important, it's totally, completely nothing at all. Stop looking at me, i don't know anything *winks*". He can pretend to Canon that he didn't say anything, and we know something's coming. Both sides happy, right? (Canon is happy too, since we might not buy a RED in the meantime)
Besides, we already have an announcement for the end of the month, so something is definately coming. Combining 1 and 1, i'd guess it's something pro-ish.