agreed with the sensible comments, the new model wont really affect the value of the old ones.
it's not like with M3s where theyre not limited editions and everyone just wanted "the new one" so the prices plummet when it comes out, theyre a niche car witha niche market and no car with the same name will have an affect on them.
do you think that mk2 RS2000 prices fell when the mk5 came out?