The new Helbrutes seen in leaks a week ago still have a lot of Chaos Marine fans watching the web for any sign of a release date for new models. There are even rumored new Chosen, Havocs, and possibly even a new supplement.
Following recent trends, if there is a new release coming for Chaos Marines it would follow the recent trends; A model release one week, followed by a book release.
I for one, would love to see the current model range for Chaos Marines updated to correlate with the models from the Dark Vengeance box set. These models are awesome, and to ignore them permanently would be a great disservice to the hobby.
Please remember that these are rumors
via Darnok on Warseer
As far as I'm informed, the Helbrutes will be available a week after the Knights Codex.
It won't go up for advance order with the new Warhammer Visions though, as the Knight books have that spot. As far as I know, the Helbrutes release is the 15th (so advance order from 8th).