It might be too early to tell, but anybody know yet if the changes to the 2010 navigation (particularly weather and Spanish-language) are able to be retro-installed into older model hard-drives with an update at the dealer?

Assuming that the basic hardware of the 2010 navi is the same, I would think the answer is yes. After all, isn't that supposed to be one of the advantages of a hard-drive based system?