According to EW, Sanchez will show up sometime during the first half of the show's fourth season for a multi-episode arc. No word on who she'll be playing, but come on, when you've got a girl who can sing like that, you let the girl sing:
While the future of McKinley’s graduating seniors remains somewhat unclear in terms of season 4 airtime, Fox’s Glee has begun preparing to fill their void. EW has confirmed that American Idol season 11 runner-up Jessica Sanchez will appear in a multi-episode arc in the fourth season of the Fox hit, but it’s unclear what role she will be playing on the musical hit.If you ask me, it's a perfect fit. More here: Glee Exclusive: American Idol's Jessica Sanchez in Talks for Multi-Episode Season 4 Arc.
First reported by TV Line, Sanchez will likely pop up midway through the first half of the fourth season. It means that Glee will have at least two reality talent show stars in its roster, with this year’s winner of The Glee Project also guaranteed a role.