In my WOW trial I can play as Dranei and Blood Elves now. Can I play as Wogren/Trolls as well?

I have a WOW trial account and I just found that I can play as Dranei and Blood Elves now. I couldn't just after the last update thing where you can have a trial account for an unlimited amount of time, but I explored quite a bit of the horde continent with my level 20 human character (Paladin) and got some quests of some dranei just before I realised I could do it. Did this unlock them or something and can I do the same with the remaining two races?