Is this even a surprise? My only real surprise is how SE managed to get into this position given the PS3 specs are a matter of record they were well aware of going into the project.
I thought SE made a bit of a mess of FFXIII with the late decision to port and the resultant inferior 360 version, and here they are apparently focused on the PC (actually understandably given the difference in PC/PS2 focus for FFXI) and getting caught short by the very well known PS3 limitations next to current PC gaming kit.
This should have be carefully planned for with early decisions on how to handle the differences and what resolution, etc. to aim for on PS3 and how to manage the assets for both that would have served as a guide to the development across each platform.
Instead, it sounds like they're suddenly facing the issues posed by the PS3 late in the day the same way they suddenly faced getting their PS3 code and assets for FFXIII onto the 360 late in the day.