That's a rather hard question to answer.
From one point of view, we've already had the blessing story TWICE (once in the series and once in the movie), so I wouldn't mind if it was left out, but then it is kind of necessary to introduce the character of El-ahrairah, so it will probably end up getting included.
I would also like, if possible, to have the other four stories from the original book. The story of El-ahrairah and the Black Rabbit of Inlé would be especially nice, but I can't help but wonder if the dark atmosphere of the original story could be better represented using traditional 2D animation...
If it were a five-part miniseries, I would have liked to have the last episode focus on the events of TFWD, including maybe at least one of the El-ahrairah stories in it, preferably The Sense of Smell. However, since there will only be four episodes, I guess it will probably be an adaptation of the original book without TFWD, so probably none of these new El-ahrairah stories will be included.
Creating more stories that didn't happen in the original? I probably wouldn't like that. I would prefer if they just stuck with the original material without expanding it too much. It would be much more interesting, I think, to see the stories that appeared in the original before creating new ones.