it is too early to pass any reasonable comments on such a situation
I don't think it's a good step, Ukrainians are still in thrall to the Russian idea of the Good Tsar hoping to fix the country's ills by edicts from above rather than do the hard work from the ground up (as Polish people have largely done).
The thing with electing outsiders is they usually can't get anything done because, being outsiders, they don't know how anything works. I predict a very short honeymoon.
I wonder how the new language law will affect things, the newly elected leader does not speak Ukrainian well... in Poland I notice signs put up for Ukrainians are usually in Ukrainian even though I hear far more Russian than Ukrainian on the street....