Hearthpwn

I still don't think that the overload deck is possible with the addition of the new TGT cards, sadly Lava Shock along with Unbound Elemental, in my opinion, just aren't enough to form an entire deck around at this stage in the game.                                                                                                                                                                                                                           However, I do like the creativity that went into this deck, I just feel like we need 1 or 2 more cards that synergize with                       overload to make this a viable deck in constructed play. 

I agree with your thoughts on replacing Nexus-Champion Saraad with Loatheb, althought Coldlight Oracle I think is meant to gain card draw in the late game if you're digging for your Bloodlust or a murloc with charge to get you a little more damage to be able to push for lethal.

With the addition of Healing Wave this deck does become a lot more viable. I think it'd be a good idea to remove the Stormforged Axex2 for Piloted Sky Golemx2 and then pray to RNGesus for Auchenai Soulpriest from the deathrattle for some insane combo damage.

I'm glad that they're giving more flexibilty with their hero power than it just being summon a random totem, now we can keep hero powering once all 4 totems are down!

I'm not quite sure if Bloodmage Thalnos would work well in this deck.  Considering the best option to play Lava Shock would following up after a turn 3 Feral Spirits into your Lava Shock then playing a Haunted Creeper or hero power totem.