writes to tell us that World of Warcraft's second expansion, Wrath of the Lich King, has entered closed alpha testing
, as reported by WoWInsider. Wrath of the Lich King, which we've discussed previously
, will raise the level cap to 80 and introduce a new class: Death Knights. World of Warcraft remains the most popular MMORPG on the market with over 10 million subscribers
. WoWInsider notes, "Various players are being invited to check it out, under a strict NDA."