A Friend of mine, Rikku, is currently going through this Mission & she believes the Mission looks very Different from the Original.
I haven't done this Mission in a Very Long time. I only remember Zero, Iron, & I going together & fighting in what looked like a T3 Version of "Rise or Fall."
Here are some Pictures she managed to Take:
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Please, if anyone knows an Update or Thread of this Mission's Change, Link it.
OOO made the change to make them both;
1. More interesting, they are no longer a linear arena... Finally, they were boring before.
2. And to also reduce the payout of the mission, it was being way over-played because of how much profit you got from it. People were neglecting the Clockworks, so OOO made another incentive to go to the clockworks. The Clockwork's arenas are still the same as the ones you will remember so want good arenas? Go delve into the clockworks.
Unfortunately although I've been around for awhile I don't know how to link x) But look in the announcement forum, there are update threads in there, read the more recent ones, ONES. I doubt it's in the most recent one.
EDIT: It's in the one dated May 9th. Here's the quote about the make-over though;
'- Battle Arena-style mission levels have received an overhaul and now feature new rooms and a slick new presentation.'
Eeyup, a well needed make-over.
~The Mighty Cheese Knight; WeeGee