A new Battlefield mod toolkit has been released, adding support for Battlefield Vietnam. Version 2.0 also has an updated menu editor, a new vehicle importer tool, and several other new additions and improvements.
Over at Primo Technology you can find a chat log from last night's IRC event with DICE and EA about Battlefield Vietnam. Questions were about things like system requirements, the gameplay style, modding, voice over cast, heat seeking missiles and a whole bunch of other things.