Well, I can tell you that I've found FSAR formats and FSEQ formats in a ram dump I was given anonymously. I presume they're the proprietary formats Nintendo use, so I'm going to document on their header formats and start working on either a branch of my 3DS application, or combine them all into one program and have separate tabs for the Wii U formats. I might just branch it off though.
Edit: Also found the FWAV format as well. Once I can find the filesize bytes, I'll begin working on the ripping of the files. I also found (What I think is) a WAV file stored in memory, but I'm not sure yet.
Edit 2: Yeah, it's a .wav file, however, the file is, for some odd reason, 0 bytes in size. Only the WAV header exists.
Edit 3: Does anyone have any clue with what the F stands for? I know that on the 3DS, everything had C (CWAV, CSEQ) and it meant CTR, and the Wii had R (RSTM) and it meant RVL, but I'm not sure what the F means at all.
Edit 4: File sizes are stored in Big Endian, I should be able to begin coding in the scanner to reflect this and get Wii U RAM file ripping working soon.