We have recently released a couple of papers on Round5:
“Round5: Compact and Fast Post-Quantum Public-Key Encryption” by H. Baan, S. Bhattacharya, S. Fluhrer, O. Garcia-Morchon, T. Laarhoven, R. Rietman, M-J. Saarinen, L. Tolhuizen, and Z. Zhang. To appear in proceedings of PQCrypto ‘19, January 2019.
“Shorter Messages and Faster Post-Quantum Encryption with Round5 on Cortex M” by M.-J. Saarinen, S. Bhattacharya, O. Garcia-Morchon, R. Rietman, L. Tolhuizen, and Z. Zhang. To appear in proceedings of CARDIS ‘18, November 2018.
The latter implementation paper is mostly out of date. A current implementation (with performance figures) is available in the r5embed project.