At the end of chap 35, it says --

"It was well that he took every body's joy for granted, or he might not have thought either Mr. Woodhouse or Mr. Knightley particularly delighted. They were the first entitled, after Mrs. Weston and Emma, to be made happy. From them he would have proceeded to Miss Fairfax, but she was so deep in conversation with John Knightley, that it would have been too positive an interruption; and finding himself close to Mrs. Elton, and her attention disengaged, he necessarily began on the subject with her."

Mr Weston took everybody's joy for granted -- but what actually were the other people's real feelings about it?

Mr Woodhouse and Mr Knightley were not happy -- we know that Mr Knightley had taken an early dislike to Frank Churchill. As for Mr Woodhouse, he did say in chap 29, when they were planning a ball at Randalls that "that young man is not quite the thing".

Mr Weston had no opportunity to speak to Jane Fairfax about it, as she was in deep conversation with John Knightley -- Jane seemed to get along very well with John Knightley -- earlier, in chap 34, he said --
'"As an old friend, you will allow me to hope, Miss Fairfax, that ten years hence you may have as many concentrated objects as I have."

It was kindly said, and very far from giving offence. A pleasant "thank you" seemed meant to laugh it off, but a blush, a quivering lip, a tear in the eye, shewed that it was felt beyond a laugh.'

John Knightley generally had reserved manners, and Jane was a rather reserved person, but as old friends they seemd so at ease with each other, that he, a good family man, could kindly and inoffensively express the hope that she will eventually have a family of her own as well, and she answered him pleasantly but with feeling.