Considering that Samurai (SAM), Red Mage (RDM) and Blue Mage (BLU) have all been hinted in multiple sources for quite a long time now (and are probably the most requested Jobs for addition to the game)... I'd say you're probably onto something.

But as they say, we will find out soon enough (my money is on new Jobs being revealed at the Fanfest later in the year ).