KMS 1.2.164 - Prelude

Im starting to doubt theres going to be 5th job
Then again, theres still a few more updates within Tempest

There has to be something. Except for Marksmen, nobody has any use for 60 extra SP in 4th job.
Combine that with their press conference hints about "a surprise for players at a still higher level" after talking about 4th job starting at level 100, and it's pretty much set.
Might not be called "5th job". Might be some kind of "rebirth". Might let characters over level 180 learn some skills from other classes. Might just add skills to 4th job, although that sounds way less exciting than "5th job" while doing the same thing. Might increase the max level of some skills (god, I hope not). But they have to do something.