Bandar Cemethe comments section on the post on my ODI site:
I can confirm these people: Sawyer, Sayid, Locke, Kate, Jin, Cindy (all decked out in Others gear), and a whole bunch of Others, including some kids
Juliette was not there, at least while i was there anyway, I watched from about 12:30 till they wrapped around 4. on my way up to the set i found out that they had stopped for lunch, there were a bunch of Others walking down in their gear, (at least 20 of them) I got a picture with Terry O’Quinn. Sheila Kelly was there, but she wasnt shooting, she was just watching, she’s gonna be in the next episode. I talked to her, I asked her if she was gonna play Kendall and she just looked at me, grinned slightly and said she wasn’t allowed to say. As far as details of the shoot, I couldnt really hear anything, people kept rolling by and taking pictures, which the crew hates by the way. So they kept pushing people back further away.
UPDATE: Apparently the woman spotted was not Kate
Earlier today we got word that the LOST cast and crew were filming at the majestic Manoa Falls.
Lucky for us and some lucky fans who happened to be on a tour of the area near the falls and spotted the filming today.
No word on what was taking place, but confirmed on set were Sawyer,
Kate a blond woman and Sayid. Maybe a continuation of Episode 6×08 Recon but of course with on-island scenes.
Hopefully we might get more details so keep checking back for more!
The confirmation is via a fan on Twitter and there are several tweets between the eye witness and other LOST fans confirming who was on set.
Here are the Tweets thanks to @LaSuaLuna on Twitter
Source: The ODI