The coyote would at least be a new species added to the game. The dingo wouldn't be, it's no more unique than the Arctic wolf in terms of taxonomy.
In any case, there's the message of the game to consider. Tasmanian devils are
highly endangered now, largely due to human interference in their habitat and the still-lingering misconception that they are harmful to livestock. The game includes several species which aren't common in zoos that are highly endangered, such as the Himalayan brown bear, in order to get a message across. IMO the Tasmanian devil is far more sensible an inclusion than the dingo.
Of course, given that an Australia/Oceania Pack is certainly now incoming, we might get neither.
@Danny_zoo pointed out the rainbow gum, and its natural range of Indonesia and Papua New Guinea, so assuming we only get the usual four animals I have a feeling we might see a tree kangaroo (most captive species are from Papua New Guinea I believe rather than mainland Australia) instead of something more 'commonly Australian'. If we do, I hope the tree kangaroo replaces the koala rather than something like the devil, but we shall see.