http://blog.sitcomsonline.com/2010/09/bet-fall-2010-schedule-has-3-new.html

The CW launches its new Toonzai kidvid brand with ‘The CW4Kids Toonzai Friday Fall Preview!’, a fall preview special looking at the CW4Kids Saturday morning kidvid sked.

This special is skedded across The CW Daytime network tomorrow Friday September 3rd at 4 pm, to be followed by a network broadcast of ‘The CW Fall 2010 Preview’ show and pre-empting the second hour of 'The Tyra Show'. Be sure to check local listings as The CW Daytime block varies in timeslot across the country.

http://toonbarn.com/wordpress/wp-content/uploads/2010/04/TheCW4Kids-to-become-Toonzai-says-4Kids-Entertainment.jpg
New Toonzai logo.

it would be nice if the locals would advertise WHEN or if they are going to show the preview specials, so far the CW one is the only one that has aired here and so far none of the other local affiliates show any of them scheduled at all.

ABC and NBC's have/will also be on their cable networks. See the story for details on airings.

so far I have recorded the CW, NBC and CBS previews; don't know when FOX will air and apparently the only time my local ABC has their fall previews scheduled in the next 2 weeks is on ABC Family (it had one scheduled for Saturday, but that was pre-empted for preseason highschool football) - hopefully they eventually show them.

As mentioned, ABC is airing their specials nationally at 5pm ET on Sept. 19 and on ABC Family on Sept. 13 at 12am.

so far I have recorded the CW, NBC and CBS previews; don't know when FOX will air and apparently the only time my local ABC has their fall previews scheduled in the next 2 weeks is on ABC Family (it had one scheduled for Saturday, but that was pre-empted for preseason highschool football) - hopefully they eventually show them.
Fox have already aired there preview show after the Jerry Lewis special it might just was on my area.