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Actually I found the answer in the above linked thread. Its going to be an XL-ATX board, not as deep as a regular EATX but much taller requiring a case with 10 expansion brackets.

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As for the name: Recent ROG boards adopted a standardized naming scheme that saw Intel boards end up with either the maximus (P series chipset) or the rampage (X series chipset) moniker, while the roman numeral that follows the name represents the generation of the chipset the board is based on. For example: the Maximus line started with the X38 chipset (an X chipset, exception before the naming standard was set) followed by the P45 based Maximus II and now represented by the P55 based Maximus III. The rampage line went from the two original X48 boards to the current X58 Rampage II Extreme. The last part of the name represents the featureset and had been inconsistent until the recent P55 Maximus III Extreme announcement. It used to differentiate between DDR2 and DDR3 support but then the extreme boards started gaining additional features over formula boards and this is where it gets tricky for the R2E and it's upcoming same chipset successor... God, why am I even typing out this crap?

Ah, expressing my doubt over the R3E name the forumites have seemingly universally adopted for the incoming board. Let's face it, the current Rampage II Extreme is more of a formula board performance wise and they are going to have to come up with something to differentiate between them. The marketing team at ASUS might go against their own naming scheme this time and it may very well end up being named Rampage III Extreme. Or, they might use "Rampage II" and change the featureset related part of the name since they are treading new territory with the size and 4 way GPU support. Or, they might just reuse "Rampage II Extreme" and tack on some nonsense at the end (4 way SLI anyone?)...

Just my two cents.