The latest version of Dropbox can be downloaded from Softpedia
Dropbox 2.5.25, a client for an online service that lets you bring all your photos, docs, and videos anywhere, no matter the platform, is now available for download and testing.Dropbox developers have released yet another development version of their popular software, bringing just a small number of changes.
According to the changelog, a rare infinite syncing issue has been corrected and a few other fixes have been implemented.
The 2.5 branch of Dropbox comes with a few interesting new features, like a redesigned Setup Wizard, the selective Sync UI is now a lot more responsive, and a few others more.
There doesn't seem to be any mention of specific features for the Linux platform but, in all fairness, the developers have finally updated the Linux version to the latest stable (although users are still downloading 1.6 from the official website).
Download Dropbox 2.5.25 for Linux
Download Dropbox 2.5.25 for Windows
Download Dropbox 2.5.25 for Mac OS
Remember that this is a development version and it should NOT be installed on production machines. It is intended for testing purposes only.