According to Autoweek.com's article, the new VW Golf, which just recently debuted in GTI form may be replaced as early as 2008 — a two-year lifecycle!
More:
http://autoweek.com/apps/pbcs.dll/article?AID=/20060329/FREE/60327016/1065
More:
http://autoweek.com/apps/pbcs.dll/article?AID=/20060329/FREE/60327016/1065