If all the whimsical stuff they add will be the roar, I won't mind too much. At the end of the day though, The Lion King universe is made to be very realistic. Anthropomorphic lions, yes, but still believable - stemming from the original pitch for The Lion King to be a animated "Discovery Channel nature style documentary". Just go and read some of the early scripts - they are a lot less friendly, and for a lack of a better word, more realistic than even the final movie is.
Mufasa's ghost came from the fact that they adopted it in from Hamlet, a base for a lot of ideas for the script - and it was the last scene added into the movie. So in many ways, the less-natural things are later additions, but still only sprinkled in sparingly.
So I really hope that TLG will not go all in with the magic stuff and leave it rather mundane. Besides, it will be much more interesting to see Kion and the guard have to deal with problems when they mostly have their own strength and cunning to solve problems, rather than the power of some Mighty Up Above.