Two Galaxy S8 model numbers tipped: SM-G950/G955 dubbed Dream and Dream213
Apparently, the Samsung is making two versions of the Galaxy S8, codenamed internally Dream and Dream2, but the model numbers are more interesting here. Samsung is reportedly numbering the Dream and Dream2 models of the Galaxy S8 with SM-G950 and SMG955, respectively. Given that the Galaxy S7 is SM-G930 and the S7 edge is SM-G935, that's quite the leap from 3 to 5 right there.
If this tip holds water, it's either that Samsung will have something else in-between, denoted as SM-G940 (like the rumored foldable phone), or the simpler explanation is that the Koreans number their editions with the culture's tetraphobia in mind. The number 4 is evidently considered unlucky there, that is why the Galaxy S III was GT-I9300, but the S4 went directly to GT-I9500.
So far, all of this makes sense. There have been rumors that Samsung is already hard at work producing 5.1" and 5.5" Dual edge displays for the Galaxy S8, so the SM-G950 could be the 5.1" version, while the SM-G955 the 5.5" model, which would be a natural successor of the current S7 edge. It's nor clear how Samsung will call them in the end, if the smaller 5.1-incher also comes with a Dual edge instead of a flat display like the S7, but we should know soon enough, given the speed with which the rumors about Project Dream are trickling down.