Multi-file selection, perhaps the single most requested feature for UploadWizard, is now ready for testing on a staging wiki. Please see Neil's announcement here:
http://commons.wikimedia.org/wiki/Commons:Village_pump#Multi-file_selection_...
I'm really excited about this, as it's the first step to making large uploads a lot more manageable without the use of third party tools like Commonist.
Other improvements in the next release that you can test now will include a better licensing workflow, including support for custom wikitext licenses, and automatic extraction of file-embedded geographic coordinates and display of those coordinates using a template.