I think the speculation has evolved into a "Reaper" type job where they'd be a melee scythe user. Most of the hints point to it, it may well build from the side to the FFXI Dark Knight we didn't get with FFXIV Dark Knight and build a new job out of that, because their main weapon choice was a scythe, could wield heavy armour (which maiming gear kinda is) and there are /some/ reaping cues, like in some of their weapon skills on scythe and some of the drains they could use on enemies.
There was some speculation on "Templar" but Templar exists in Final Fantasy Tactics and I think Yoshi P said it would be a job new to the Final Fantasy universe. Templar came about because somebody decided to look up the author of the comic associated with YoshiP's t-shirt this time and their surname was "Temple", but I wouldn't be surprised if YoshiP did that on purpose to mislead people given it was how he hinted Samurai. And it wouldn't explain his Children of Bodom t-shirt, unless of course it's a scythe wielding Templar I guess, just like the main character in Dante's Inferno.
But I feel like it'd be a stretch, though a cool concept because it'd marry up the Warrior of Light and Warrior of Darkness aspects into 1 job and if they were going to do that with a job, it'd be a good time to do it.
But as Ralph said, YoshiP sometimes does big brain level of hints so there could be some next level staff we're not considering...or we could be near the mark because he also once wore a bugs bunny t-shirt to hint Viera and you don't have to think /too/ much into it.