Since posting up on the Helbrute Dataslate, I am getting lots of confirmations on what this is exactly. Most of these people have seen or read through the upcoming White Dwarf so these are very reliable, but should always be taken with a grain of salt until an official announcement.
Please remember to consider these as rumors. It appears that this is a formation for fielding multiple Helbrutes. Considering how cheap they are to field, fielding multiples will not be that hard to get into army lists.
Here is a link to the site that has the image.
http://descansodelescriba.blogspot.dk/
via BadTucker in the Faeit 212 Comment section
yeah i read the WD today - its true - it gives further rules for hellbrutes, specifically a formation for them.
via an anonymous reader from the Faeit 212 inbox
Here is Dataslate Helbrutes-
Delves into the history of the Chaos Space Marine Helbrutes
Includes fameous examples
Additional rules for fielding multiple Helbrutes as a formation