Sony NS-WS623 is available only in the Black color.
Yes, Sony NS-WS623 does have NFC connectivity option.
You can check the charging status with the lamp ( 3 ).
While the battery is charging: orange when charging is complete: green
No. It does not have.
Sony WS623 has 4GB internal memory and you can further expand it up to 16GB with the help of MicroSD card.