If SHIV is nothing more than a seperate/independant game, using the SHIII engine, and released 1st quarter 2006, I can pretty much guarentee that there will never be any Official Addon to SHIII.
Maybe UBI feels instead, that they can make a better return on investment in the Asian market, with a Pacific Sub sim, rather than expand SHIII? :hmm:
Would be a real shame.