A performance by Mr. Steve, who sang of how sad the world would be without PBS kids’ shows, kicked off a preview of programming for younger viewers today at the PBS Showcase in Baltimore. One project sure to generate news is a two-part episode of Arthur set to air in October that will tackle the subject of cancer. An animated Lance Armstrong appears to talk about his battle with the disease and the program was developed in partnership with his foundation. Then there’s The Cat in the Hat Knows All About That, voiced by actor Martin Short, the first time the classic story will appear as an animated series. (However, Time magazine’s Tuned In columnist is dubious about that.) Over the coming months four “stunts” are aimed to draw not only the younger audience but also press attention as well. On Memorial Day there’s a special Super WHY!, “Hurray for Heroes,” targeting 8- to 10-year olds. Labor Day brings the premiere of Dinosaur Train, the much-anticipated second series from the Jim Henson Co. On Thanksgiving comes a Curious George one-hour holiday special, then on President’s Day is a special Martha Speaks, as “Martha Goes to Washington.” Check out the next Current for an interview with Lisa Henson and the creative team behind Dinosaur Train, its latest for PBS since the hit Sid the Science Kid.