There are 8 new houseguests, so 3 pairs of previous HGs will be entering the house to play as well.
There's a page at CBS.com with 6 Duos, they want us to vote our favorite: Big Brother: Which duo will return to the house?|Vote Now - CBS.com
I wonder if they have other duos on standby...no way would Will/Boogie want to do this again. I bet the 3 couples are already selected, and the poll is just gauging how the viewers feel...
Press release from CBS:
"BIG BROTHER" PRESENTS THE SUMMER OF "DOUBLE TROUBLE"
BIG BROTHER Welcomes Eight New Houseguests and Welcomes Back Some of the Most Notorious "Duos" from Past Seasons;
The Identities of the Returning "Duos" Will Be Revealed During the Season Premiere on Thursday, July 7
BIG BROTHER welcomes eight new Houseguests, plus the return of some of the most notorious "duos" from past seasons, when the CBS reality series premieres Thursday, July 7 (9:00-10:00 PM, ET/PT) on the CBS Television Network. Julie Chen is the host.
This summer's twist, "Double Trouble," will feature the return of some of the most dynamic "duos" in the history of BIG BROTHER. The return of these former Houseguests will immediately impact the way the game will be played this summer.
The identities of the returning "Duos" will be revealed during the premiere episode on July 7. Below are the eight NEW Houseguests who will spend the summer playing alongside the "Duos" in the new season of BIG BROTHER: