Since WoD is launching in the middle of the week, will the juggernaut mount still have a 100% drop rate on Tuesday/Wednesday?
WoD Launches on 13th, not 11th or 12th, even if it isn't the beginning of the week it still doesn't and shouldn't change anything.
I would imagine that the mount stops being 100% the second you're able to level past 90.
I believe this gives EU players a unique advantage to squeeze in one extra lockout's worth of guaranteed mounts.