Every deck has can be re-sorted. If you hit the gear icon at the top right, there's a "Standardize Sorting" button which will resort it by type, then by cmc ascending, name ascending.
The sorted deck's list is then copy-paste-able.
This is how I quickly standardize all decklists for articles, etc. I post them as is, sort, then copy-paste back in for a beautiful order and card-count labels. It's not as quick as an import, but definitely better than going with excel, etc.
I will also be adding a deck popup that should have "Import from Arena".
Since Deckbox & Deckstats have "Export for Arena", this should work.
Sorting and labeling by the same Standardize method would be part of the import.
I'm about to finish "CT", and its release will necessitate some rework of the deck tags as I add a few things. Doing the deck popup should follow shortly after.