The big changes:
- It's based on the Pinax web framework. This should make it easier to add features to the site.
- It's running on ConceptNet 3.5 instead of 3.0. (So was the old site, kinda, but it was a hack that wasn't sustainable.)
- It distinguishes between "assertions", the normalized connections between concepts that Open Mind learns from, and "statements", the roughly parsed text that people have typed in. You can vote on both of them. This is a key step toward putting back the free text box.