Coming out December 2010, the Nike Structure Triax 14+ continues along the path of its predecessors. Using the same tooling as the Structure Triax+ 13, which means the midsole has not changed (still uses Zoom Air for added cushioning), the latest version makes minor tweaks to the upper. Since the ride quality of the 13 is well liked, maintaining the midsole/outsole configuration on the new version is a good thing. This continuity allows past users a greater chance for success with the update.
In October, for the last several years, Nike has been producing winterized versions of two of their best selling running shoes: the Nike Air Pegasus and Nike Zoom Structure Triax. What Nike does is they take the normal road versions, add a GoreTex membrane (waterproof/breathable) with minor tweaks to the upper and poof, you get shoes ready to take on the wet and cold of winter. The only drawback in the past has been a slight change in fit, which was the result of a stiffer upper that changed the toe-box shape compared to the supple mesh used in the regular versions. For October 2010 that all changes. Thanks to a new toe-lasting process and material improvements, the Nike Air Pegasus+ 27 GTX and Nike Zoom Structure Triax+ 13 GTX are intended to provide the same fit of the mesh versions. We will have to wait and see if this holds true once the production versions arrive, but the samples looked good.