Actually Mod Stu said no Summer Special first in yesterday's RS3 Livestream. I don't know why is it a not "huge yikes" and not a "huge yikes specifically for OSRS". My guess is probably RS3 players are not that "yiked" by no Summer Special.
Edit: Mod Poerkie said no Summer Special, to be more precise, not Mod Stu. The context of this discussion remains. There is no "huge yikes for RS3" regarding no Summer Special. It is pretty much like a "shrug for RS3" and nobody even talked about it.