Eden Espinosa and Megan Hilty are the current Broadway leads of Wicked.
Idina Menzel and Kristin Chenoweth originated the roles of Elphaba and Galinda/Glinda in San Francisco and on Broadway.
Whoever told you that they were more recent leads was WRONG.
Plus Wicked is far too expensive a show to ever open off-Broadway. It played an out of town run in San Francisco (as stated above) to work out all the kinks.
For someone who doesn't even like the damn show, I know more about it than I'd like. Stupid BWW.
"You're the worst thing to happen to musical theatre since Andrew Lloyd Webber!" --Family Guy
"Shut up! It's been 29 years!!!" --the incomparable Patti LuPone in her MUCH DESERVED Tony acceptance speech for Gypsy.
Kitzy's Avatar du Jour: Kitzy as Little Red Ridinghood in her college's production of "Into the Woods"