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This behavious exists on live servers since 4.0 if not even earlier.
What I meant is that using both ice and explosive trap I could get proccs within 1-2 sec instead of 12 sec while using BA or Explosive only.
Ice trap triggers "weak L'n'L" (as I call it) if it debuffs target. Apparently it doesn't work on bosses and boss level dummies. As far as I remember in 4.0 and early 4.1 it did not overcome Explosive shot cooldown even though LnL buff appeared. Testing it in 4.2 I got a bit different result. Now it provides LnL buff and instantly removes ExS cooldown.
Black Arrow, Fire Trap, Explosive Trap and Freezing Trap trigger "strong L'n'L". It provides LnL buff and instantly removes ExS cooldown. This effect is not blocked by internal cooldown of weak LnL, that is you can get weak LnL and then strong LnL during weak LnL internal CD. Unfortunately it doesn't work in opposite direction, so Ice Trap after recent BA's LnL will not grant you another LnL.
This kind of mechanics provides magnificient possibilities for bosses with minions. For example, you can get 2 LnL procs in one Ragnaros transition phase. You can make similar tricks for Betty (on small spiders), Ryolith (fragments are all yours), Alisrazor (especially useful on meteors). I believe survival spec has not got enough love of community even though it can beat marksman in some encounters.