• CBS "Meet Nina" pre-game video
• Full CBS "Meet the Cast" video

• Official CBS Survivor: One World bio page

Collection of images from the preview and other circa-Ep1 One World footage:

Vidcap gallery: Click on thumbnails to expand; use arrow keys to navigate between enlarged pics.

From MSN.com's pre-game interview with Jeff Probst:

"Nina says: I have watched the show since the first episode. I was feeding my baby thinking, 'This is me.' I think it's important to get along with everybody but not trust anybody.

Jeff says: Nina is a former cop who is a little rough around the edges, given how slick the rest of this group is. If they just give her a day or two to see what she can bring to the party, she brings a lot of wisdom and patience."

From her official CBS bbio page:

"Personal Claim to Fame: Receiving a full ride basketball scholarship to Santa Clara University, finding the perfect husband and, of course, my kids.
Inspiration in Life: My mom – she was a feminist before it was acceptable. She taught me to be confident and encouraged me to pick sports over cheerleading.
Hobbies: Working out, cooking, gardening and target shooting.
Pet Peeves: I hate whining, being called a "girl" and rude drivers.
3 Words to Describe You: Tenacious, competitive and confident.
Survivor Contestant You Are Most Like: Stephenie LaGrossa, because she was tough and stood up for herself, and Sue Hawk, because she spoke her mind.
Reason for Being on Survivor: I want to prove that a 50+ year-old woman can compete. I love challenges, both physical and mental. The money would also be a great help to my kids with college.
Why You Think You'll "Survive" Survivor: I thrive on being a team player; I have a never-quit attitude and I can deal with pain and discomfort.
Why You Think You Will Be the Sole Survivor: In 1991 and 1993 I competed for the S.W.A.T. Team. Both times the two week tryouts took place in Camp Pendleton and I was the only woman competing against 19 men. There were 40 S.W.A.T. officers judging the process. Neither the competitors nor the S.W.A.T. members wanted me there. I had to mentally, emotionally and physically challenge myself everyday."

Summary of evidence for Nina Acosta being on Survivor: One World.

- Nina was the first contestant spoiled by castaway208 (10/6/11), by just giving her name: Nina Acosta. SurferZ (10/6/11) matched the name to the correct Nina, a former LAPD officer.

Who is Nina Acosta?

She's the oldest female contestant this season. This old NPR story tells about her attempts to become the first female SWAT team member with LAPD. Worth a listen/read. Apart from that, she has very little online presence, unless it's been cloaked until the cast reveal.