The first secret of the salvage cube is that it's not called the "salvage cube." There's a lore and a story behind it that's not been revealed yet[http://diablo.incgamers.com/blog/comments/the-lore-of-the-unnamed-salvage-cube/], however, we are privy to its name. According to Bashiok, it is named the "[[Nephalem Cube]]"[http://forums.battle.net/thread.html?topicId=27810241169&sid=3000&pageNo=4#64]:

::<blue><font color="#FFFFFF">Bashiok, is it true? Is the salvage cube named the Nephalem cube? Would you mind clearing up the confusion you unfortunately created with the possible misinformation?</font><br>It is indeed. I wasn't aware Jay had said that.</blue>

<blue>It is indeed. I wasn't aware Jay Bashiok had said thatthe name of the cube was a slight spoiler, so it would make sense to expect some sort of presence of the [[Nephalem]] in Diablo III.</blue>

Bashiok had said that Prior to the name reveal, the actual title of the cube object was a slight spoiler, so it would make sense to expect some sort of presence of mystery. During the first sighting in the [[NephalemArtisan Video]] in Diablo III., Jay Wilson called it just a "special artefactartifact." in the Artisan video. Into this void had stepped fans with early options including the Horadric Dumpster, Horadric Recycling Bin, and Horadric Trash Can.