New stars are flying into the Broadway blockbuster Wicked this spring. Keri René Fuller, currently the Elphaba standby, will assume the role full time, and Emma Flynn, who most recently played the lead role of Cher in the West End musical Clueless, will make her Broadway debut in the role of Glinda. They join the cast at the Gershwin Theatre on March 3. Lencia Kebede and Allie Trimm will play their final performa…