The Teaching Channel and Achieve have teamed up to create four really excellent videos about the Next Generation Science Standards. They can help you (1) understand the rationale behind the new standards and (2) tweak your current lessons to emphasize the central tenets of the standards.
All of the examples in the videos are related to earth and physical science, but they apply to life sciences too. Teaching life sciences can be tricky because it's hard to design experiments that allow children to directly experience life science concepts and processes. That's why Nancy Chelsey and I wrote Perfect Pairs: Using Fiction & Nonfiction Books to Teach Life Science, K-2. We are currently working on a companion title for students in grades 3-5.