This is the first issue with the new costume.
Issue 26 is the start of a new story arc. No prior reading knowledge is needed.
Bruce Wayne has exiled Jason Todd from Gotham. Artemis and Bizarro are missing. Jason's on the road alone, though he and Arsenal are both tracking a criminal drug organization.
This issue is pretty violent, especially when compared to other Bat-family titles. I don't like to dwell on "action scenes" since they are often repetitive (of each other) or last for too long, but Jason's fight with a biker gang is well-drawn and written. His internal monologue is a nice recap for both longtime readers and newbies.
Good stuff!