You can see the info regarding the times, dates and locations for the castings Here. And check the site out for yourself Here
I can't copy and past the info from it but it lists the actors involved with the movie in the roles we now know to be confirmed, but with the as yet UNconfimed Juno Temple as Holly Robinson. Now like I said, this might just be who they assume she is playing based on fan speculation, or, they may know it to be the truth. I guess we won't until it's revealed officially. But expect that to be soon enough as shooting draws near on Christopher Nolan's final Batman movie, and Temple's(seemingly) being the last role WB have yet to announce.
For those of you unfamiliar with the character of Holly Robinson, Wikipedia provides..
“Holly first appeared in Frank Miller’s Batman: Year One as a juvenile prostitute who lives with Selina Kyle. Holly plays a small but significant role in the story when she encounters a disguised Bruce Wayne during one of his early attempts at crimefighting and stabs him in the leg. Wounded by this attack and a subsequent battle, Wayne escapes back to his home, brooding on the fact that his enemies do not fear him. This encounter is an impetus for his creation of the Batman persona. As such, Holly plays an indirect role in the Dark Knight’s origin - Holly has no meta-abilities. She has been taught stealth, athletics, hot-wiring, lock-picking, thieving, acrobatics, and the martial arts by Selina. Ted Grant trained her in a form of kick-boxing adapted for street use, as well as English boxing. She has also spent time at a Female Furies training camp. She is proficient in the use the whip, firearms, and knives. As ofCountdown to Final Crisis #10, Holly had a portion of the cunning and skill of Diana, Goddess of the Hunt. While she possessed these powers, she was an excellent marksman, and had the ability to track people by their scent. She lost these powers after returning to Earth.”