I think the blurb about the free flip powers that require a matching ally will really add a fun new element to Limited play. It will be interesting to see if a lot of the new heroes become a force in Constructed play due to the power of the new synergistic class allies. Warrior-man could be a beast!
Personally, I'm extremely excited that Death Knights will have even more opportunities than usual to get some great class-specific cards in each set this block, as they have a TON of catching up to do! Not to mention, I love the fact that DK's don't have to wait until the end of the block to get their themed set. Scourgewar FTW!
Also, I really hate to say it but I hope that the Horde Hunter will get a better free flip! This Dwarf requires a really specific weapon type AND ally type on board to get a +1 counter. Hopefully there will be more than one Ranged weapon in this set to raise the probability, but still...say it with me...poor Hunter.
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