The older one was concerned around dynamic tiles, while the newer version of the Start menu is more fluent, sober and modern. They bring the static concept back along with modern variations.
One Can Still Keep The Dynamic Interface.
The new look of the Windows 10 Start menu targets to put to an end the variegated tiles and gives the customer a lucid experience irrespective of which theme the user has configured. The menu interface also gives an illusion amounting to total transparency and highlights the new icons of applications recently in the deployment stage The Windows team still maintains that the design is not perfected and some work is needed. Furthermore, more features will be added to augment the customer experience. When this feature will be put into circulation is still not finalized. More possibilities are being looked at. The dynamic menu is still going to stay irrespective of the implementation. Microsoft shall only take a call on the final fate of dynamic tiles after feedback from the customer comes on the beta stage which will roll out shortly. Via Gizchina