I feel that this LFE release further validates BEAM as a promising platform for future development of new programming languages. Also I look forward to reading SICP converted to LFE. Available chapters can be found here https://www.gitbook.com/book/lfe/sicp
Given you mentioned SICP... SICP is cool for its math and its puzzle-like problems, but I found http://scheme.com/tspl4/ a much better introduction to Scheme and more likely to help me solve problems with Scheme in the real world (i.e. a good reference book).
TcpKali mascot is an example of great visual identity for open source projects: kawaii-touched fearsome ancient god zapping servers. It's both memorable visual symbol and an apt metaphor for core feature (load generation).
RJ-45 connectors with a skull hanging from the neck and a latte cup are just cherries on top.