I typed something extremely too long forgetting about the 1000 character limit. Anyway, here's the cliffnotes:

-ARC/BRD is DPS priority and support secondary now. Confirmed by the switch from CNJ to PGL as secondary job.

-As of P3, ARC was parsing highest DPS but all jobs were still missing a lot of abilities so it's unfair to say it will remain this way at 50, especially when some jobs were missing their combo skills (LNC with Full Thrust). Though ARC didn't get River of Blood which could keep them top. Also ARC can be 100% mobile and outside PBAoE's while PGL and LNC cannot.

-[Editted in] Also as of P3, PGL was out of TP while I as ARC still remained at 500+ due to their increased action speed. In addition, their damage per action was much lower. A lot to see later on though.

-ACN seems to have a great potential to be there if they can balance mana and keeping their dots up 100%.

-BLM is going to be interesting to see the rotation to balance Astral Fire and Umbral Ice in return with their other combo abilities (Fire to Fire III for example). It just seems like BLM is a lot of chances versus full potential like LNC or PGL. (ARC has a lot of chances too).