Florence is most likely out now she’s announced the summer tour with no APE. There would be no reason to not include it if she were booked at the moment.
They only seem to have the three days on their website. Although it does say in the description it’s a 6 day event. I suspect that’s more of a copy and paste from last year than anything else.
I think it’s probably more cultural than language, but in principal the same thing.
I wouldn’t expect them to play in the U.K. this year, and with APE already having the MIA situation, I would be surprised if they booked Arcade Fire.
I would expect so, but everyone is playing cards close to the chest after last years flood of events, and the lack of headline level acts in cycle this year.