It was pretty obvious that's who was coming, since anything coming up from deep in the Earth's core tends to be the Silurians.
I quite liked the old look Silurians, these ones don't have the third eye, but presumably this was to allow them to look more expressive to our eyes. I guess this could be explained away as being only related to the original Silurians, and not necessarily identical. Alternatively they could use the mask as an explanation, and suggest that the "other" Silurians just wore a different mask, with a third eye on it.
Kind of an OK episode so far, but like others I get annoyed when I have to wait a week for resolution!