Unfortunately, Joe is/was sleeping when this information surfaced thus its not yet up on the main website. Tonight the Japanese Yahoo and Pokemon website have updated with the names of the newest Pokemon DS games, HeartGold and SoulSilver.

There is now a forum open to hold the discussion of the games. It can be found here http://www.serebiiforums.com/forumdisplay.php?f=178

Please keep in mind that the forum will be moderated until more information is revealed. There is no point in having 30975984 threads for wild and crazy speculation that we've all been hearing since pre-2005. There is a thread for you to post ideas in however.

The following is taken from the info thread in our newest forum:
Quote Originally Posted by Shining Mew View Post

Yes, it's officially confirmed. Tonight the Japanese Yahoo site updated with the logos of the new Pokemon games for the DS: HeartGold and SoulSilver. The rest of the update is mostly a recount of how successful the original Gold & Silver were, its 10 year anniversary, and speaks of the 1st gen remakes on the GBA. An expected release date of Fall 2009 is also listed. Obvious enough.

And for those of you who would still have doubts (there always are!), the official Japanese Pokemon website also updated with the logos and an even shorter blurb with the same information, adding that old and new elements will be present in the games.