1) Will we be able to play the game with "Triple Monitor Display"? (I think 'Evefinity' run's it now?)
nVIDIA 3D Surround Vision works very well on the current version of the game (3 monitors display in 3D), the borders between display in that kind of game is not a problem, you can even put all the logs in fullscreen on the side displays and have a constant clean main display !
2) Can we play the game in 3D?
Yes, as I said you can play the current version very well with nVIDIA 3D Vision for a single 3D display, or nVIDIA 3D Vision Surround for 3 3D display.
There are some games that looks awful in 3D because of rendering problems, but FFXIV works great in 3D, at least with nVIDIA hardware.
3) Can the new engine allow a display of Over 60fps?
I really hope we will be able to play at 120fps/120Hz in 2D, the alpha engine was locked at 30 fps and 720p (that was painful), then the current engine is locked at 60 fps, and it's still awful to have this limitation.
But I'm afraid that the new engine will still be locked at 60 fps, and the reason for that is the PlayStation 3......... this console can't render more than 60 fps.......
And as for Vsync problems, if you play in fullscreen, you can force the Vsync inside the nVIDIA drivers, it works very well, and better, since the last version of the drivers, an adaptative Vsync is available, it's a Vsync that has less impact on framerate huge drops.
What this games needs badly is to be able to play with a dual screen mode like some very few games like World in Conflicts, the second display will only be used for logs, mini or not so mini-map, and all kind of UI stuff, in order to have the main display clean:
http://www.youtube.com/watch?v=5_xo44QV8AI
And as for DirectX10 or 11, I am very doubtful they will use them, even if in the screenshots of 2.0 we can see some very little volumetric lights effects (god rays), usually those are possible with DirectX10, I'm really hoping they will switch to a modern APIs, but I am very skeptical...