UPDATE: According to The Hollywood Reporter, Colfer's manager has stated that Colfer's Twitter account was hacked, and his publicist has said that Colfer is on a mid-Atlantic flight with no wi-fi, something that would prevent him from updating his account.
Additionally, in a statement released by 20th Century FOX (which produces "Glee"), the hacking was confirmed, as well as a strong refutation of Colfer's dismissal:
"We’ve been alerted that Chris Colfer’s Twitter account has been hacked," reads the statement from FOX. "Rumors of his dismissal from Glee could not be further from the truth. We love Chris and look forward to working with him again this season."
Original story follows, for posterity:
After five seasons, arguably the most popular (or second most popular, sorry to snub you Lea Michele) cast member of FOX's "Glee" just announced that he's been let go from the show.
As to what these personal issues are, as Colfer explains, "explanations coming shortly." Whether those will be explanations from him, FOX, or both, stay tuned.
Colfer is best known for his role on the FOX show, but has branched out in recent years as a best-selling author, and indie film producer. Colfer is leaving the show as it enters its final (sixth) season in the Fall.