Huh... the extra dungeons remind me of Soul of Chaos, more than anything else. Y'know, that sort of hodgepodge of minigames within a dungeon.
Of course, I say that because Soul of Chaos was the only one I've delved deeply into, before I got bored enough with FFI to move on. I'm currently dealing with the Sealed Temple of FFV Advance, which is shaping up to be the same sort of thing (capture a Behemoth...? What the hell?!)
Looks like the sort of thing Square does with reissues, these days.
I must admit I didn't see the monster arena coming... then again, it's not really a surprise, either.