Xsi 5.1 2006 edition (thought i was clear when i said is a xsi scene earlier :P ) aka Autodesk Softimage.
The bulding design/characters/armours/pets are completly created in xsi and exported as nx3/dds
Animation, since xsi got the animation part yes is created too with xsi and exported as naf
Enviroment design they used spt (speed tree plugin ) to create it
The monsters/creatures design..part are used as pets..and ofc design is created in xsi...part is imported from somewhere else..thats why they need time to create new pet...basicaly they create the design for it.(such as armour/sets etc)
To recreate from scratch lets say an character in xsi... with an new armour ofc, new hair (hairstyle tooked a whyle to be redesigned cuz it takes time to build the geometry) probably took weeks, for a cg guy .
Thats why the scn are so important..they allready have all the dimensions, and for armours lets say..we only buld new geometry of armour no longer whole character, and the paint/mesh.
welcome to cg world :P
ps: need e2 client link ... if it has psd in there.. that are used for rotoscoping...dang