The 6.8 is a new round designed to get a bigger bullet diameter into the dimensions of a 5.56 NATO, so that the 6.8 can be (and is) chambered in the AR-15/M-16/M-4 rifles.
6.8mm converts to the 270 bullet diameter, and the parent case is I believe, the old 30 Remington.
As a civilian cartridge, it doesn't offer anything, as the ballistic performance is far less than the 270 Winchester of the same bullet diameter.
I suppose if you have an AR-15 in 223 currently, and want something that makes a bit larger hole, it might have some appeal.
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