There are some recent rumours, posted at DarkUFO, about Tania spotted filming the 6th season of Lost:

Today, “LOST” was spotted back at Waipahu High School. And, like last time, Michael Emerson (Ben) loomed large. But it’s the other stars that were spotted that make the school shoot so tantalizing. According to Pati from New York, mixed amongst many backpack and book toting students was none other than Tania Raymonde, Ben’s deeply mourned daughter Alex.  She also saw, to my great glee, ninth grade science teacher Leslie Arzt (Daniel Roebuck).

Source: hawaiiweblog.com

Updated 11/13

Some new details posted at DarkUFO:

- At the school, Alex (Tania Raymonde) is actually a student at this school where Ben is a teacher. She is still "close" to Ben.
- Also spotted at the school are both boom boom Doc Arzt and Rose! No signed of Bernard
- One of the new guests that you posted, William Atherton, was on the set. He is actually the Principle of the school, however I'll leave you with this cryptic snippet. Although he is the principle, that may not actually be his only role!
- Locke and Ben both work at the School