We believe so, yes, but are not committing to a minimum baud rate this early in development.
The main issue with broadband and MMOGs is still a matter of cost server side, even though bandwidth prices have gone down. In other words, it still doesn't make sense to send out a lot of data to each player's client, even if they do have the capability to receive it. Now, obviously this will change, but we’re confident that by the time it does the vast majority of players will have broadband too.
Source: Official FAQ