could anybody tell me whats the meaning of this?
I mean, a one remake by kyoto?

Showing the attention the studio paid to the production notes. She's a random classmate that has a half dozen lines in the game, but they did include her where appropriate in the anime.

Yeah, that's Kyoto for ya. They did loads of that stuff in Haruhi too. They master at detail.

Also shows off the superiority of KyoAni's character design.

'Nanase Rumi' was also apparently a major heroine in One...
Heh. So I guess she's not much of a 'random classmate' anymore.