This is definitely one of those "I'm going to wait for the peer review" claims, but it is pretty exciting.

Pros: The author is not a dilettante, and is actively researching in the area (http://theory.cs.uni-bonn.de/blum/Forschung/forsch.var)

Cons: It's not my area, but I was expecting something a little more novel for a solution to P?NP. This almost seems too simple (it might almost fit in a margin...).

Could be pro or con: Single author. It's becoming rare for important new work to not have multiple authors, especially from professional academics. However, Andrew Wiles...