Where Have All the Trailers Gone?

Am I the only one who thinks its pretty weird that there's no trailer yet for Clash of the Titans 2 (Wrath of the Titans)? The movie is set to be released March 30 but not even a teaser trailer. What kind of way is that to promote your blockbuster? And speaking of blockbusters without trailers, where's the trailer for Ridley Scott's "Prometheus"? This is one of the most anticipated sci-fi films of the last 10 years yet here we are only 7 months from release and nothing, not even a teaser. Weird.

All we currently have from Ridley Scott's "Prometheus" due out on June 8 2012