DPS: The main source of damage with this build is Rain of Toads. Unlike it's unruned counterpart (Plague of Toads) RoT is a dependable, short lived, high DoT. Grasp of The Dead (Groping Eels) is also a cheap, but effective DoT that has snaring capabilities.
Regen/Resource: At first glance some might think Spirit Barrage's (If the Spirit is Willing) purpose is to also be a DPS skill. Wrong. The only purpose of SB in this build is to be used in conjunction with Rush of Essence. RoE + SB + Golden Rune = Very high mana recovery capabilities.
Survivability: Here is what I see lacking in a lot of other builds that have come before mine. From my understanding based on what I've seen (official gameplay vids, unofficial vids, leaked PvP vids), the WitchDoctor is almost/ just as soft as the Wizard. Jungle Fortitude is great passive that strait up reduces damage taken by 20%, but the real survivability in this build lies with with ZombieDogs modified with an Indigo rune to make Life Link (40% dmg absorption @ rank 4, 70% @ rank 7). With this combo of JF and ZD/LL, you won't be that guy in the party that always dies in one hit (D2 Reference). The Gargantuan is there for the sole purpose of tanking.