Bungie has confirmed in a blog post on its site that characters created for the Destiny beta will sadly not survive to see the full game.
"Since the Beta, we’ve continued to tune and adjust the game," explains designer Tyson Green. "The way you earn experience has been adjusted up and down a bunch of times. Items have been added and removed. New features toggled. Although there’s no single monumental change, the sum of the tweaks leaves characters from the Beta Build in strange shape that would be confusing at best, broken at worst."
Not surprising, perhaps, but still a little disappointing - I'd been holding out hope for my Guardian.