Hmm. I found a strange thing.
The above mentioned "October 2010 Updates" is quite small. It does not even contain the racial stats changes and other revisions suggested by "Changes Coming in Essentials" article.
Dungeons & Dragons Roleplaying Game Official Home Page - Article (Changes Coming in Essentials)
On the other hand, if you click "Rules Updates Archive" and read the "Compiled Rules Updates" there, you see those revisions are included as updates for PHB and such.
Dungeons & Dragons Roleplaying Game Official Home Page - Article (Official D&D Updates Archive)
Hmm? Does that mean the design team has forgot to add those revisions into "October 2010 Updates" file?
Or, are they considering "Changes Coming in Essentials" to be, actually, a kind of "September 2010 Updates" or something?
This kind of "stealth" update is very, very inconvenient.