Mars seem to be mainly concerned with 16th & 17th century sets so unlikely at least for the moment they will do any Vietnam War sets but if I remember rightly Haron said earlier this year that he is working on several Vietnam War sets to be added to the Orion range possibly towards the end of this year.
Re: Pics of figures are on the same page as the box. Just scroll down
I have most of the Mars 1:32 Vietnam War range, the figures are a little rough but at the same it's nice to finally see some Vietnam War sets in 1/32 plastic and they seem committed to doing a complete range. TSSD also has a couple of Vietnam sets. I was talking to a dealer at a show and he was surprised at how this conflict is suddenly getting some nice coverage. Now we just need that spirit to filter down to the 1/72 market