Not true, the pitch they are working on, and have been with Hansen is his change. He's got a fine slider, and it really was nasty in the spring. They want him to refine his change because they believe that maybe at some point Hansen could make the jump to a starter, but right now they see him as a closer at least they do by everything I have read.
I think that in the past most of the Red Sox prospects have fizzled, true. This is different though. The Sox farm system was ranked 8th overall, and thats impressive. Don't doubt that most of these guys turn out to be solid major leaguers. My definition of solid might be more conservative than yours, but I definetly see most of these guys (pedroia, lester, papelbon, hansen, martinez, delcarmen, etc.) being solid major leaguers. I see most of them being good.
http://www.projo.com/pawsox/content/projo_20060411_11pawsox.d8a728c.html Not a bad article right there.