ESPIO'S NEWS
Here's the reported news from October to December 2006.
December 27, 2006
Knuckles in Sonic and the Secret Rings
It seems that Knuckles will be in the multi-player games for the Sonic game on the Wii that is due to come out in "Spring 2007." Only Japan has a definite release date (March 15, 2007).
Sources: Sega of Japan & Sonic HQ
December 9, 2006
Sonic The Hedgehog #169 Released
That issue came out over a week ago in the US/Canada. There's a Chaotix back-up (starring Espio mostly) in it, if you have no other reason to get it. ^_~
November 25, 2006
Sonic The Hedgehog #170-172 Previews
After not doing anything with Knuckles or the Chaotix for over awhile, it seems they're starting to remember the group. You can read the previews for the stories that mention the group here.
Source: Silver Bullet Comics
Sonic Rivals Released
Sonic Rivals has been released for the PSP in North America and Europe.
Source: Gamespot
November 16, 2006
Sonic The Hedgehog Released
Sonic The Hedgehog has been released for the X-Box 360 in North America.
Source: Gamespot
October 2, 2006
Sonic #167 Preview
You can see a preview of Sonic #167 over at Comics Continuum.