I still think FFIV and FFV Advanced were superior to the PS1 ports(hell, even the Final Fantasy IV Collection version of FFIV for PSP was superior). FFVI was relatively unchanged from the earlier American version with the exception of what you listed(bestiary, run button), the CG intro and ending and, well, it actually being called "Final Fantasy VI" instead of "Final Fantasy III".
Besides that, is this thing even going to get a release outside of Japan? Honestly, I just can't see that happening. Packages like this are a gamble because you have to speculate that your target audience actually has their PS1, PS2, PSP and PS3 all in working order(or maybe just PS2, PSP and PS3). It probably would've been more convenient if they did a collection with FFI-XII on two blu-ray discs, and FFXIII separate disc for PS3.