Of course PETA are going to attack the biggest game of the decade! It's publicity for them. But here's my prediction as to what will happen. They'll probably publish some lame bullsh*t on their website along the lines of:
"Animal cruelty, as is displayed in Rockstar's Grand Theft Auto 5 is disgraceful for any video game to glorify. Games developers should be more responsible, blah blah blah waffle waffle boo hoo whaaa whaaa whaaaa etc etc etc"
Then everyone will laugh as their worthless opinion violently crashes into the sea of a thousand f*cks that nobody gives, while gamers around the world unite to raise one giant middle finger at them as usual.
Seriously if they'd put their efforts into helping real animals in need instead of prancing around defending non-existent digital creatures then maybe I'd have a little sympathy for them.