Lets look at the big picture. These are just my expectations. Feel free to post your own.

No one will get a nerf (yet). Classes that are low will be buffed. The on average ranking will be as follows for a fight with mechanics:

1. SAM, BLM
2. NIN, MNK
3. SMN, DRG
4. RDM, MCH
5. BRD

Notes:
BLM: best BLM might out dps best SAM. Both have low utility

SMN: they will get QOL changes and a small buff.

DRG: they need it.

RDM: mobile ranged class that can heal, raise and buff. They should be near bottom of the pack if YoshiP is true to his words.

MCH: they need it. This class is the one I'm most unsure about.

BRD: ranged, mobile class with high utility. All top parses have one.

Final note:
It may seem like RDM is getting nerfed in these rankings but it's not. All classes should be viable. If the top dps is 5k the bottom dps will be 4k. Currently it's more like 5k and 3.2k.