As a follow up to the question about hyperdrives on TIE fighters, what is different about the new First Order standard type TIE fighters vs. Galactic Empire ones?
Besides aesthetics, what changes has the TIE fighter undergone?
The main difference worth noting is that new TIEs (Official name: "TIE/fo space superiority fighter") got deflector shields.
Source: Star Wars: The Force Awakens: Incredible Cross-Sections
While visibly similar to older TIE/lns, these latest models boast improved solar cells and higher-capacity converters, the products of Imperial research conducted for the TIE Advanced program.
- Thrusters rotated 90% from old TIE models for increased maneuvrability
 - your picture in the question is looking so different from old TIE for a reason - it's NOT a TIE fighter. It's a very upgraded TIE/sf Special Forces model, distinguished by red hull (because cool?)