If you're going to ask, well... it would be rude of me to deny you. That said, this is just idle speculation, and probably a bit more than asked for, so take it for what you will.

Ilberd is the Griffin. Everything about his MO lines up with what you'd expect of a man in his situation.

For some reason, Nero is working with him (despite the fact he shouldn't be able to get into Cartenau and he was supposed to have had some positive character development after CT, but I digress). Now that Ilberd has Nidhogg's eyes, and Nero knows the location of Omega, the ancient doomsday machine is going to be reactivated with Nidhogg's eyes as batteries and the Resistance (or at lest the Masks) are going to use it to punch on through the Garlean defenses surrounding Ala Mhigo. This will lead into 4.0 as we try and get both the Ala Mhigan Resistance and Garleans to focus their attention on the enemy they should really be concerned about - Ilberd and the Masks rampaging around in Omega, causing collateral damage that kills Garleans and Ala Mhigans alike - and, after strained negotiations, possibly aggressive negotiations, we'll enter an uneasy alliance of convenience with Garlemald to take down Omega. The Masks will use Omega to eat the primals of the local beast tribes after we defeat them until we destroy the thing a la Ultima Weapon.

Haven proven our valor and honor to him by taking down the Triad, Regula van Hydrus will turn on Garlemald or at least be the bridge between us and the Empire.

Nidhogg may be reborn as Shinryu as a result of some resonance effect with Omega. After the merciless thrashing we gave him despite not being Ishgardian, his enmity will have shifted from Ishgard only to all mortal races, and the 4.x patch series will be about taking him down along with easing hostilities with Garlemald and repatriating the Ala Mhigans. 5.0 will lead us into Garlemald, though for what reason I could not even begin to guess.

Where Tupsimati factors into this, I have no idea. I can't fathom why Papalymo wanted it "to keep it safe," given we're put in mortal danger time and again and always manage to come out on top. The further away from 3.5 we go the more vague it gets - I'm guessing based on what seems apparent, not psychic.

Red Mage and Samurai are almost definitely being added. I'd like Viking just because it's such an oddball class to add, but...