They should leave cap 50 until shortly after PS3 release. Then just, gradually, raise cap to 99(classic FF style) and focus/balance the game with that in mind.

When they were thinking of a level cap for FF11 they had some crazy # of like Lv200+ or something in mind. They eventually settled on Lv.75. After all these years they decided to do 99, but the game was built around Lv.75.

Basically, I'm hoping that they have some kind of concrete level cap to base the game on. That way they don't have to do radical adjustments that shake the foundation that the game was built around.

As with FF11, as the level cap increases, they will likely make it faster/easier to EXP at lower/mid levels by adjusting the curve.