I think they solved the talking Japanese issue quite well.

Ditto. Shifting it from dub-like to sub-like to let the characters actually speak JP was the right choice.

I hope they keep it the same way for the english dub – so I am curious how that will work out there.

For the german dub I don't have any expectations – they also dubbed the spoken foreign languages in german since the first episode. When I listen to it when Paul and Zenith I talked to Rudeus as a baby ... it was an instant fail ... and it surprised me how careless the handled the whole series.