Basically the infinity coaster is the next generation Eurofighter. Improvements have been made to the track and the vehicles are completely redesigned for improving the ride and maintenance. The new trains also have the ability to handle much more speed making mega coasters possible.
There is nothing preventing an Infinity coaster from having a beyond vertical drop, if Gerstlauer are asked to design a large custom Eurofighter there is no way they are going to use the old system.