Sony need to push Demon Souls remake, so they can't talk about any Bloodborne update. It will run up to 60fps, then wait some years for another remake.
1) It is part of the PS+ Collection Pack "thingy" made to showcase the fantastic library of PS4 games on the PS5....so read into that what you will.
2) There is already a patch made by someone outside of sony that runs at 60fps (not well based on "found footage") on a homebrew capable ps4 pro.
I am sure you will find out in the next few days when the nda is up. It won't be a remaster...it will probably be 60fps and faster load times.
Well here is a review of Bloodborne running on the PS5....in 30fps mode. So....without looking at the version that is coming with the PS+ "pack" looks like locked 30fps still.