Weddingbee boards

All over the different wedding blogs & websites I've seen breathless recaps of "bridal fashion week." And they are advertising some beautiful dresses! How does this work?

I see dresses advertised for "Spring 2010." That's a year from now--the people who'll get married in them likely aren't even engaged yet! Does that mean they really won't be available until the spring of 2010? And for that matter, what happened to the dresses of fall 2009? 

Please forgive my fashion ignorance!