Not much. They are
1. Image upload 2 - nothing crazy- it just allows an image to be uploaded in 2 buttons though ideally this can be one.
2. Code input - allows C, Java codes to be added in code editor which can then be prettified using google prettify
3. Math entering via codecogs and latex rendering via MathJax
4. List styling - so some lists shows A,B,C,D and some I, II, III,IV as required.