Which battlegrounds are in WoW Forever?

Warsong Gulch, Arathi Basin, Alterac Valley, Darkspear Islands.

How do I join a battleground?

Talk to a battlemaster in a capital city; the Darkspear Islands also has portals at the faction bases in the Barrens.

Choose a battleground: how to win, its map and objectives, how to get there and what its reputation rewards.

Battleground	Levels	Team	How to win
Warsong Gulch	10–60	10	The first team to capture the flag three times wins.
Arathi Basin	20–60	15	The first team to gather 2,000 resources wins.
Alterac Valley	51–60	40	Killing the enemy general wins the battle.
Darkspear IslandsNew	30–60	15	The first team to 2,000 points wins.

Which battlegrounds are in WoW Forever?: Warsong Gulch, Arathi Basin, Alterac Valley, Darkspear Islands.
How do I join a battleground?: Talk to a battlemaster in a capital city; the Darkspear Islands also has portals at the faction bases in the Barrens.