For all users of svn, the rc4 is out ;)

"
After much trail and error, I'm happy to announce Subversion 1.5.0-rc4,
available from:
http://subversion.tigris.org/downloads/subversion-1.5.0-rc4.tar.bz2
http://subversion.tigris.org/downloads/subversion-1.5.0-rc4.tar.gz http://subversion.tigris.org/downloads/subversion-1.5.0-rc4.zip
http://subversion.tigris.org/downloads/subversion-deps-1.5.0-rc4.tar.bz2
http://subversion.tigris.org/downloads/subversion-deps-1.5.0-rc4.tar.gz
http://subversion.tigris.org/downloads/subversion-deps-1.5.0-rc4.zip
"

Finally, merge and tracking options are available ;)
And some others :
* Merge tracking (foundational)
* Sparse checkouts (via new --depth option)
* Interactive conflict resolution
* Changelist support
* Relative URLs, peg revisions in svn:externals
* Cyrus SASL support for ra_svn and svnserve
* Improved support for large deployments on FSFS, via sharding
* Improved FSFS optimizability, via immutable file isolation
* WebDAV transparent write-through proxy
* Improvements to copy and move
* Speed improvements, cancellation response improvements
* Easier to try experimental ra_serf DAV access module
* API changes, improvements, and much language bindings work
* More than 150 new bug fixes, enhancements

Check the releasenotes