Looking to the US, I notice ABC are really pushing No Ordinary Family. They've made the premiere available online for free to the first 50,000 people who click. Most of the feedback is apparently positive. It's also had a logo change, as has The Whole Truth. They have trailers for it everywhere too.
CBS - the network with arguably the biggest schedule changes has been heavily promoting Mike and Molly during its summer hits like Big Brother. I've seen ads for Hawaii Five-O as well. Survivor (moving to Wednesdays after 19 seasons on Thursdays) is odds on to win its slot on Wednesdays. It has also 2 new twists, which should be interesting to see!
NBC are hoping for a much better season, after all of their scripted dramas failed last year. To be honest, their new shows do look very good, especially The Event and Chase. The Apprentice (normal version) is also back this year, so they're in pretty good stead. They're advertising The Event heavily (and they should).
FOX has got a few talked about new shows such as Lonestar, but as usual, Idol is expected to prop up their ratings again.
The CW has got 2 new shows, Hellcats and Nikita. Hellcats looks to be cancelled before Christmas, however there is an air of suspense about Nikita, which has The Vampire Diaries as a lead in, which could be very valuable.