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A general description is here.
New generic function .DollarNames() to enable class authors
to customize completion after the $ extractor.
The 'open' modes for connections are now interpreted more consistently. open = "r" is now equivalent to open = "rt" for all connections. The default open = "" now means "rt" for all connections except the compressed file connections gzfile(), bzfile() and xzfile() for which it means "rb".
index.search() is no longer exported and has a different argument list.
New generic function .DollarNames() to enable class authors to customize completion after the $ extractor.
load(), save(), dput() and dump() now open a not-yet-open connection in the appropriate mode (as other functions using connections directly already did).
The 'type' argument of index.search() is deprecated: there are no longer directories of types other than 'help'.