The impression I got was that, yes, there will be a new site for the surveys and you will need to log into this separately from the review site. The survey earnings will go into one account and the review earnings will go on your current account. I also got the impression that all current surbey earnings will be transferred to the new account, so I cashed out, can't really be bothered with the surveys at the moment so i wanted to get any earnings I had before they get transferred. Not sure if there will be a cash out limit or not.
Also, and I may have read this bit completely wrong, they seem to be saying that when you log into your survey account you can look to see if there are any surveys available for you to take.
This is the overall impression i got but I deleted the E-mail pretty quickly and probably didn't read it that thoroughly.