Battle Royale has 21 now with Zelina Vega added per last night's SD.
Asuka, Naomi, Carmella, Nia Jax, Ember Moon, Alicia Fox, Dana Brooke, Lana, Billie Kay, Peyton Royce, Mandy Rose, Sonya Deville, Tamina, Torrie Wilson, Michelle McCool, Alundra Blayze, Ivory, Molly Holly, Kelly Kelly, Maria Kanellis, Zelina Vega (21)
Ronda/Nikki w/Brie (Raw Women's)
Becky/Charlotte (SD Women's)
Kairi/Shayna (NXT Women's)
Mae Young II Finals
Alexa/Mickie vs Lita/Trish
Natalya/Sasha/Bayley vs Riott Squad (6-Tag)
Thats 40 in all so far (including Brie in Nikki's corner).
With 21 in the BR so far, I think 9 more would come from NXT and/or leftovers from MYC II. Maybe a couple more legends (Jacqueline? Victoria plz?!)
E: forgot the Nattie/S/B & Riotts match