Yes they have. It's in the weekly updates from around the alpha. It's going to be wiped.
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found of reddit ____________________________ Beta wipe (self.DestinyTheGame) submitted 6 days ago There is no official info either way, most recently DeeJ said in an interview with Eurogamer "So, it's certainly not a promise or an announcement that we're making at this time. It all depends on what we learn and how things shake out. So, we're certainly not telling players they can carry their progress over, but we haven't made any announcements either way." Anyone stating it as a definite actually has no evidence, as far as I am aware. Edit: Downvoted for spreading information instead of rumours, nice work.