As for the toy part, One-Step Changers are just what you expect with that title - a single move to swap modes and priced for $9.99 each. Eighteen different figures at that price point will be release in May, but so far only the 7 below have been revealed. There is also Chomp and Stomp Grimlock (right pic) priced at $79.95 for release in August. From USA Today, "The Dinobot boasts a chomping jaw and light-up in eyes in beast mode, and has an easy transformation to sword-swinging robot, too. Grimlock also interacts with his fellow toys — he comes with a non-converting Optimus so kids can relive the extremely nerdy moment from the trailer where the Autobot rides Grimlock into battle, plus unlock sounds and pop-out weapons. Plus, he can be used with other One-Step Changer figures and has different lights and sounds whether you pair him with an Autobot or Decepticon." Bumblebee is a "Mega" One-Step Changer priced at $29.99, also for August release. Now the Changers are described as being for "youngsters". Based on a slide from Hasbro's Investor Event, they tend to break ages down in terms of 2-4 years (Rescue Bots), 4-10 (Robots in Disguise, Kre-O, Construct Bots), 11-17 (guessing Generations, TF: Prime) and 18+ (Encore, Masterpiece). One-Step seems to go in the 2-10 range so they probably have more planned for the other age brackets.
As for that Investor Event, Hasbro hinted at some of their plans for 2014. In regards to Transformers, get use to Age of Extinction as they plan on carrying on the movie line to at least 2017. As for TF4, it was described as the "next chapter in the Transformers saga" where if the 1st movie was about a boy getting a car and the girl then the fourth is "about a truck that needs a friend to save the world." Hasbro did re-iterate plans to continue the Transformers: Generations line (which to me is one of their best ever) and they are developing Transformers mobile games and video games for 2014 but no specific details provided. They also showed off first official images of the fan created (and IDW supported) new Autobot called Windblade along with a new Generations Jetfire mold that looks spectacular. The full slideshow and other Hasbro wide details can be found at TFW2005.
So to sum it all up, Hasbro has big multi-year plans from Transformers: Age of Extinction, continuing the Generations line and revealed more of simplification approach to the movie line. While they might be too simple for long time fans, its still to early to draw meaningful conclusions as maybe 10% of the movie line has been revealed so far. Hopefully will learn more from Toy Fair 2014. Thanks to Sean W. and Feris O. for the heads-up. Update: Added the Hasbro Investor Presentation Video below.