Where did they go?

They are most likely with the others who are at the temple.

Do you think we will see those kids again?? If so, they, like Walt, would have grown up a bit. Thoughts?

I think the reason they brought them up last night was to show us that we would see them again this season.

I would think they would have to hire new kids to play them and hope we all just accept that that was them. they couldnt pull off a walt thing with them as they live on the island.

Most likely they're with the other Others.

I think the reason they brought up the kids last night was to give us an idea of a time frame of the scene.

The episode where we saw the teddy bear. It's apparent, the island can't have new babies, so the steal ready made ones.

Few things mentioned about the kids:
1) he thanks Juliette for taking care of them
2) Juliette mentions that their mother is in L.A. (will we see a future connection?)
3) Ben tells her that they were on the 'list', and who were they to question the 'list'... WHAT LIST.. who wrote it?

It's 11:00. Do you know where your kid are?

I also wondered about the future connection to the kids since it was mentioned they were in LA. I amsure TPTB will eventually answer the questions.... but i found it interesting they finally brought the kids up again