in my opinion a good set of races for an azshara expansion would be satyr for alliance and naga for horde.
the satyr which join the alliance could be satyr trying to follow in the footsteps of avrus the redeemed, who was a satyr in ashenvale allowed in by the night elves because he wanted to redeem himself, at the end of the quest chain he sacrifices himself to save a little girl and is turned back into a night elf. the satyr we play as could want the same thing, but just not quite there yet.
http://wow.gamepedia.com/Avrus_Illwhisper
the naga could be followers of neptulon who were outcast by the other naga when she usurped neptulons realm.
as for your idea? man you won me over as soon as i saw you had plunder isle and tel'abim. and then i saw broken isles. man you have everything ive always wanted from an azshara expansion. and all your creature ideas are fantastic.
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what do playable turtle men have to do with pokemon? theres only like 2 or 3 lines of turtle based pokemon.
it would make more sense to say ninja turtles is that way -> because ninja turtles actually has a turtle similar to the torra called spike
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not to mention sargeras didnt plan to marry her and just wanted to steal her stuff. she probably wants to kill sargeras more then we do