I heard an unofficial rumour that, in Japan, they are working to port all the GB, GBC and GBA games for download use on the DSi. The downloading system would be making it's arrival in the far east somewhere near the end of 2010, with only the more popular titles at first. Just like they did with the Virtual Console section on the Wii.
They won't be any remakes of some kind, just direct copies of the old versions.
I do hope the got the first GB version of LA too, not just the DX one....
Unofficial, but more exciting than more official rumours.
I'm more hyped for finally playing LA again, than I am for the next Wii title...