I can't find anything on it I'm afraid.
The MX (2 core) seems to be the original MX. The 4 core version may be the MX 2 released in 2012, with the Note II?
(2012 - Samsung Galaxy Note II (plus improved graphics), Meizu MX2)
The S2 plus seems to be the exact same phone as the S2, but with less memory, and just with the Jelly Bean operating syste pre-installed.
It also will not be rolled out to the UK market where I live.
The on die chip is just manufactured at a lower nanometre scale, but is essentially the same chip as on the S2. It will just run slightly cooler, and they'll be able to get a lot more chips out of the same wafer (cheaper)
Considering the S3 in the US doesn't have a Wolfson, and the S2 plus seems to be a manouver to get more sales, and cheaply, I doubt for a second the audio chip will be a Wolfson.
Plus, Samsung can choose what audio source to put in, as I don't believe the audio chip is within the processor/graphics die.
But I will try and find out.
Edited by musical-kage - 1/10/13 at 6:17pm