Abhyankar's conjectures in Galois theory: Current status and future   directions
  In this paper, we survey the major contributions of Abhyankar to the development of the theory of fundamental groups and Galois covers in positive characteristic. We first discuss the current status of four conjectures of Abhyankar about Galois covers in positive characteristic. Then we discuss research directions inspired by Abhyankar's work, including many open problems. 
David Harbater, Andrew Obus, Rachel Pries, and Katherine Stevenson
math.AG math.NT