The rumour says so and its thought atleast the Cyberman are due to there appearance in trailers but no place in episodes. As we know episode 5 will be The Weeping Angels again. Episode 6 is the Dream Lord (apparently). Episode 7 are the Vampires, Episode 8 & 9 are the Silurians and Episode ten is thought to be a new villain. However having all of these characters is a bit dramatic but they may until we know for sure.
No, this is one of those bull rumours that people exagerate. There will be a few returning, but nothing else.