From bike rumor:
The new frames are 20% stiffer…they have the same torsional stiffness as the Pro Tour-proven Tarmac SL3…and they get the same tapered headtube design on the Elite models with bearings set further up the steerer tube for enhanced stiffness due to increased surface contact area (details are a bit sparse on that aspect, we’re working on it). The seat tube gets butted, swaged and formed into a squared shape at the bottom bracket, strengthening one of the highest stressed areas on the bike.
Being Specialized’s competitive but affordable road model, the Allez comes with both high performance builds and one version with SRAM’s new performance touring compact double Apex group.