save : we don't know until it's released.
language : if the save can be ported, replacing only some files could work, but you better get the full version instead of the language folder only. (it depends how the languages are managed)
I hope online will work (with spoof5.5.0 if no new update is released) with the retail disc.
We can probably patch the system library calls to read from SD card as well, those are typically passed by loadiine, but if we had the actual update files on the SD card we could patch those to read.