what would you think if there was a harry potter novella?

ok, i know this is sort of a copy of twilight where stephanie meyer wrote a novella,
BUT regardless of that what would you say if JK rowling wrote want, (also put aside the ebooks on pottermore)

BTW: a novella is like a short book about a specific part of a novel so in other words the novella could be about diving mais into snape's and james and lily past, or mais into harry future or dumbledore's secret past, etc...

also i know much information has been released to interviews and vídeos but there still are lots of unanswered question, so just think about what you would like to know :D

Questions:
would it interest you or not?
who/ what would you like it to be about?
reasons for said answers?