1. Correct, mSATA is SATA II
2. There are no (to my knowledge) SATA III mSATA SSD's. And standard SSD would be plugged in via sata cable to any of the SATAIII ports.
3. Yes, it will support 2133MHz, but you will have to overclock it or set the XML profile.
On question 2 I was referring to the mSATA and Mushkin has a 120GB SATA3 mSATA available. That's why I was wondering.