Interesting, you have a link?
http://www.supremecourt.gov/opinions/12pdf/12-96_6k47.pdf
The gist of the ruling is that the VRA is still in effect, and you cannot discriminate when it comes to voting on basis of race. What is changed is that most of the South had to "pre clear" any voting law changes with the Department of Justice, based on their (very very real) previous discriminitory (exclusionary) tactics. This is what Sections 4 and 5 of the acts cover. Section 5 describes pre-clearance, Section 4 sets the conditions that require pre-clearance.
What the court did was strike down Section 4 as outdated and unconsitutional due to this. Congress can re-write it and try again.