Warner Bros. is heading back to Jellystone Park, moving ahead on development of “Yogi Bear” sequel.Studio’s signed the writing team of Joshua Sternin and Jeffrey Ventimilia to script the project, which will again be produced by Donald De Line and Karen Rosenfelt with Andrew Haas exec producing. Jon Berg’s overseeing for Warners. Sternin and Ventimilia teamed on the script for Fox’s “Rio” and for DreamWorks’ “Peabody and Sherman.” The live-action/CG animated “Yogi Bear” turned out to be a better performer than initially expected, opening modestly in mid-December with $16.4 million domestically before showing long legs and topping $100 million in U.S. grosses. Pic grossed another $100 million internationally. Dan Aykroyd voiced the title character and Justin Timberlake was his sidekick Boo-Boo with Anna Faris, Tom Cavanaugh, Andrew Daly and T.J. Miller starring in the live-action roles. Eric Brevig directed; Sternin, Ventimilia and Brad Copeland received screenplay credit.Yogi’s character, inspired by Art Carney’s portrayal of Ed Norton on “The Honeymooners,” first appeared in Hanna-Barbera cartoons in 1958 and was voiced by Daws Butler. Sternin and Ventimilia are repped by WME.