well my analysis goes as follows... i dun think they have deviated much from what they showed in the trailer...
1) Navya aint shown as bold or naughty but very relaxed and chilled out and fun loving but that's with ritz n appy ((her childhood frnds)... even in the episodes, she is very free with ritz n appy
2) Well anant was not exactly shy, but bemused (can be judged from his smile in the trailer when he gets ink marks on his white shirt)... as for the bookworm part, both have been shown with their books at some time or the other... and navya has not been projected as a bookworm... just that she takes studies more seriously compared to anant...
3) About being Fida, if we notice carefully, right from the beginning of the trailer, we can see Navya is more fida on anant (when anant lifts up the book which falls from navya's hand n also when navya's dupatta is over anant's face, navya is all shy)... and then there is the part where anant looks at navya dancing n gets lost... well this shows even anant is fida on navya... so both fida on each other)... and even in the show, navya is a silent admirer but anant's actions speak out that he is totally fida on navya... so again both fida on each other...
Sorry to differ but this is my take on the show and the trailer... :)