New Jobs in 4.0, perhaps this pic has some hints

[Jim_Berry]

doesnt help that NIN has all the THF skills now , even the chained skills are named on FFXI THF weaponskills ....so i dont expect to see thief ever ...sad because thief has nothing to do with ninja....but thats FFXIV for ya.

If you're referring to FFXIV, then this is true. However, in "Final Fantasy", Ninja is upgraded from the Thief job.