what is new emmc different than the old one?

> I have 64bit Vista so it is hard for me to flash it, so i will wait for the OTA update tomorrow.
>
> This time there is update for the EMMC and Rom, so when I do the Wifi OTA update.
> do I still need to flash the emmc? or it will update both emmc and rom together automaticlly? what,s new about the emmc? by the way, mine is USA version PR 1.1.1
>
> Thanks