Okay, just to make this clear for some people.... 358/2 Days is confirmed for Japan release in 2008. DS Games only take a month or 2 to re-make into English So, that's how long it should be. 1 or 2 month difference.
BBS and Coded are not set for any release date but it is believed that both of them are set to come out sometime 2009. Coded most likely before BBS.
BBS should be out in Japan possibly October 2009. Sometime around there. Could be longer if they REALLY want to add more stuff to it.
Meaning NA release would be about early 2010. Coded will probably be about March 2009 and the NA release (if they're even going to have one) will probably be May-June 2009.