Game Club Central has written up a preview of Dungeons & Dragons Online, based upon what they saw of Turbine's MMORPG during this year's E3. A snippet, as usual:
D&D Online has chosen to go for a small, community-focused approach to game design. Their servers will only support up to one-thousand players concurrently. This decision is not a technical constraint, but rather a game design choice that the developers hope will foster an increased sense of community and belonging, especially for those players who are new to the game. To facilitate this emphasis on community, Turbine has chosen to have the city of Stormreach be the central hub not just for new players, but all players. Quest, ability, detection, and commentary information is passed on to players either on a party or individual basis allowing for a 'DM' to give information on events, trap detection, saving rolls, among other things. Party members will be responsible for passing along private information to the party (or withholding it depending on the situation).