No, we can't bring over any Thief content into TDM due to the obvious legal issues. Eidos holds the copyright on Thief, and we'd rather that their crack legal team didn't send us any cease and desist notices (or worse).
As much as we'd all love to see an original campaign, it's lots of work to make them, and I'm not aware of any serious efforts yet. I'm sure it'll happen one day, just don't hold your breath for now. :)
On the plus side, many new fan-made missions are in development. In particular there is a Christmas contest to make more missions (which anyone can enter), and we're hoping that will be quite popular and result in lots of missions to play.
The core team will also continue to put out content updates, some of which may be accompanied by the release of missions which depend on delayed content (like undead, which are mostly working internally but weren't quite ready for release).
Crispiness
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