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A general description is here.
‘pdf()’ now has an ‘offline’ argument. If that is set to ‘TRUE’ then the device does NOT create a PDF file (but it can still be queried, e.g., for font metric info).
‘Sys.putenv()’, replaced and deprecated in R 2.5.0, is finally removed.
Some functions which have been defunct for five or more years have been removed completely. These include ‘.Alias()’, ‘La.chol()’, ‘La.chol2inv()’, ‘La.eigen()’, ‘Machine()’, ‘Platform()’, ‘Version’, ‘codes()’, ‘delay()’, ‘format.char()’, ‘getenv()’, ‘httpclient()’, ‘loadURL()’, ‘machine()’, ‘parse.dcf()’, ‘printNoClass()’, ‘provide()’, ‘read.table.url()’, ‘restart()’, ‘scan.url()’, ‘symbol.C()’, ‘symbol.For()’and ‘unix()’.
‘parallel::detectCores()’ is now able to find the number of physical cores (rather than CPUs) on Sparc Solaris.
It can also do so on recent versions of Windows; however the default remains ‘detectCores(logical = TRUE)’ on that platform.