BEAST v1.10.4 fixes a bug when trying specify a burnin on the command line version of LogCombiner. It also introduces two new command line options specific to BEAGLE v3.1 (-beagle_threading_off and -beagle_thread_count).
BEAST v1.10 is a major new version with many new features focusing on flexibility of model specification, integration of different data sources, and increasing the speed and efficiency of sampling.
The new version coincides with the publication of a paper describing many of the new features:
Suchard MA, Lemey P, Baele G, Ayres DL, Drummond AJ & Rambaut A (2018) Bayesian phylogenetic and phylodynamic data integration using BEAST 1.10 Virus Evolution 4, vey016. DOI:10.1093/ve/vey016