Both the seat tube and head tube are on pivots that allow you to adjust the bike's geometry. This is useful, but represents an older school of thought on bike sizing. I personally find it easier to think of tri bike sizing in X-Y coordinates, which is the philosophy behind the Retul Muve as well.
Our second day on the Interbike showroom floor was another great harvest of gear photos and new info. Today we looked at a variety of things, from Campagnolo EPS all the way down to a simple BTA bottle from Profile Design. There's plenty of great stuff in the gallery - have a look, and check back in tomorrow for our final gallery.