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A general description is here.
‘par*apply’ and ‘par*applyLB’ gain an optional argument ‘chunk.size’ which allows to specify the granularity of scheduling.
The declaration of ‘pythag()’ in ‘Rmath.h’ has been removed - it has not been provided since R 2.14.0. [Deferred until ‘Rcpp’ catches up.]
‘parLapplyLB’ and ‘parSapplyLB’ have been fixed to do load balancing (dynamic scheduling). This also means that results of computations depending on random number generators will now really be non-reproducible, as documented.