Thanks for your interest in Intel Edison.
I was looking for the information you need and I found the datasheet regarding TXS206-29, here is the link: http://www.ti.com/lit/ds/symlink/txs0206-29.pdf. To summarize your questions:
- The terminal B2 in TXS206-29 corresponds to VBATT
- The terminal B3 (VCCB) is connected to the VDD in the SD CONN G46739-001 (Refers to the Edison schematic)
- The terminal A3 is both WP/CD
Hope this information helps, if you have any other question, please let us know.