Building and expansion WoTLK Classic Gold strategies are now fairly different. Night elves no longer build and mine gold differently from the way other races do. Since trees of life could initially mine without help from worker wisps, it was very easy for night elves to greedily expand to new resource points. The difference is that wisps (the night elf worker units) no longer disappear when they construct buildings, and since you don't have to constantly build wisps, Blizzard requires wisps to work in an entangled gold mine. 

To some extent, the easy expansion seems less important than it did, since more players can rely longer on the initial gold mine. Plus, having three or four mines going is now impractical. To protect those essential expansions, defensive structures are generally much stronger, except for the World of Warcraft spirit towers, which were quite strong enough already. To build structures and defenses more quickly, humans can team peasants to work together, but they are the only race with this ability. And since defensive structures are more potent, there's more reason than ever to buy sappers at one of the neutral buildings, which can take a tower down in one kamikaze charge.

Blizzard has started introducing major Battle.net features into the beta, starting with the ranking system. In the World of Warcraft chat room, a menu comes up when you right-click on a player name, which lets you see a stats page, whisper a message to the player, and more. The stats system tracks a player's win-loss record separately for solo and team games, as well as for each race, including the random race option. Players level up on the ladder system with an experience point system, and Blizzard has said that once you reach level 11. losing will remove as many points as a win, so the system should effectively separate players by skill levels. As players get more wins, they buy WOW WoTLK Classic Gold get special icons next to their name, and there are different icons depending on the race that a player is best at. Blizzard has a page with those status icons here.