You can find original Kraken changelog in the CHANGELOG file on github.

Changelog

• seed-Kraken v0.10.4-seed
  • Release based on Kraken v0.10.4-beta and Jellyfish v1.1.11_seedmod
  • support for seed weight (kmer length) up to 31 and seed span up to 63
  • classification algorithm is based on LCA resolution on separate strands and selection of result from strand with higher number of hits