There have been a few not-quite-serious-enough-to-justify-a-release security fixes that, along with a couple of serious bugs, we think together DO justify a new 0.8.* release.
So I just created a 0.8.4 branch, based on the 0.8.3 branch, and will be cherry-picking from the master branch.
Planned changes from the 0.8.3 release:
Security-related:
42656ea Make RPC password resistant to timing attacks
159bc48 Simplify storage of orphan transactions, fix CVE-2013-4627
37c6389 Performance optimization for bloom filters (help mitigate potential DoS attack discussed last week)
Bug fixes:
9bf2a4ab Fix multi-block reorg transaction resurrection
bf81a3ef Fix Gnome bitcoin: URI handler
f0784ac4 Fix non-standard disconnected transactions causing mempool orphans
2461aba1 Mempool consistency check
pull 2916 Import OSX fsync change from LevelDB subtree (will hopefully fix the random-OSX leveldb corruption issues)
There are lots of little fixes that could be included, but those will wait for the 0.9 release.
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Gavin Andresen