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What, if any, forgeworld units can a Deathwatch army take?

RAW, none as most FW units were designed before Deathwatch were released.

As ignored now there is no FW units available to the Deathwatch. Although they did release a picture hinting that rules were on the way.

From Facebook:

The Sokar pattern Stormbird specifically says Deathwatch is allowed to take it. The Deimos Pattern Vindicator Tank Destroyer says it is a "Heavy Support choice for any Space Marines Faction Codex (including Dark Angels, Blood Angels, etc,.)" That "etc." would seem to include Deathwatch.