Very loving realization of stories.
But at least the trailer is based on excessive use of CGI.
As a child I watched a lot of European nature documentaries, which were elaborately observing nature over many months and years and then showed unaltered pictures. Only cut and time-stretching was allowed as a technical means. It ment a code of honor. Since this is hardly affordable today, there are only a few filmmakers and teams left who keep up this tradition. Of course, the use of computers helps here to achieve faster success. Ratatouille has been a nice straight forward CGI, but this mixed form of Tiny World becomes somehow unpleasant.
I would like to see the series, with times of CGI fake use should be pointed out, in the trailer probably 40% (e.g. as a small colored dot in the upper right corner of the picture or optional subtitle info). Then I might fall in love with that format too.
Otherwise one should consider it a continuing attempt to cheat. And it is no documentary, it is Disney/Pixar.
Imagine your children think that this is a reality they can experience, how disappointed they will be from a walk in nature...