The teaser will allow players to use Manchester United, AC Milan, Porto, S.S.C. Napoli, Santos FC and C.A. Panarol in ten-minute matches.
The demo will also highlight the Challenge Training mode, which will teach players many of the new control systems featured in the game.
A second demo with a new roster will also be released in mid-September, and will feature Tottenham Hotspur, FC Bayern Munich, FC Internazionale Milano, Rangers FC, Club America and Sport Club Internacional.
"We have spoken a lot about the new additions to PES 2012, and now we want users to see it for themselves," said European team leader Jon Murphy.
"By releasing a demo for preview purposes, we want people to get in early to try out the Teammate Control elements and to see for themselves how the Active AI works.
"This will then be followed by a second demo that offers different teams, and a closer approximation of what the final game will play like."
He added: "We truly value the support and input of our user base - and these demos are so they can see how their help has aided the most ambitious PES to date."
PES 2012 will be available on September 27 in North America and October 14 across Europe.
> Read our review of PES 2011
Watch PES 2012 Video 1: Overlapping runs:
Watch PES 2012 Video 2: Diagonal Runs:
Watch PES 2012 Video 3: Dummy Runs:
Watch PES 2012 Video 4: Zonal Defence:
Watch PES 2012 Video 5: Zonal Marking:
Watch PES 2012 Video 6: Off the Ball Controls: