The Silurians Officially in Series 5 of Doctor Who

A British actress by the name of Neve McIntosh has given a long interview to the Perthshire Advertiser in which she talks about her role as a Silurian - actually as 2 Silurians since she plays twins - on Doctor Who.

She also talks about Matt Smith and says:

“I think he’s going to be really good, the best yet out of the new guys.
“The stories have got a bit darker. I play twins, and they’re big lizardwarrior women.
“They’re one of the Silurian tribes that have been undisturbed under the earth. And of course we get disturbed.
“It’s the first time I’ve worn prosthetics but I’m still recognisable if you know me well enough.
“But there’ll probably be lots of people going, ‘Who the hell is that?’”

Below is a picture of a Silurian taken while filming a while back.
This account, as well as the above picture, thus confirms the presence of the Classic Doctor Who monster that never made an appearance during the RTD era.

Source, Source