Q: Does Bazaar yet support the ability to duplicate a file and preserve history on both the original and cloned files?
A couple of years ago I was evaluating Bazaar for my company's VCS. There's a lot I really like about it, but one important factor ultimately led us in a different direction: the lack of a bzr copy (or equivalent). This may not be particularly relevant for some teams, but its a pretty common operation for us.
I know the issue was discussed extensively in the past (see references below), but I'm not clear on whether anything was ever implemented.
References
As you probably saw here, it has not been implemented yet and I'd be really surprised if it happens soon if at all :(