Well, Facebook.com announced through it's PES 2010 page, that " Pes 2010 The last 13 days left to run demo.. 23.09.09". This was posted a couple of hours before
We'll keep you updated, for the records, here is the original article we posted earlier today:
"Not really a comment on the post but just read on the PES 2010 feed on Facebook the demo will be out on September 23."
Apparently some guy at the PES 2010 Facebook site, posted this: Emre Ekinci Demo releases 23 september


We will keep you update, as for now, it's one guy in Facebook who already got the attention of tons of people, as well as Pesgaming.com, which in their latest IWP, have a mention to this
Since the game will be out Oct 23rd, I guess, September 23rd would be a good date. I assume the guy just estimated the release of the demo, but anyway, we will keep you updated

Posted by Xavier Title Pro Evolution Soccer 2010 Company Konami Platforms PC-Xbox 360-PS3-PS2-PSP-WII Category Sports - Soccer Release 2009-10-23

Total Reads : 677657 Screenshots Trailers

Title	Pro Evolution Soccer 2010
IGN Trailers	Pro Evolution Soccer 2010 trailers at IGN: click here
GameTrailers Videos	Pro Evolution Soccer 2010 trailers at GameTrailers: click here
Platforms	Microsoft Windows Vista/XP Microsoft Xbox 360 Sony Playstation 3 Sony Playstation 2 Sony Playstation Portable WII