As you may know, there was a lot of work done on WebKit this summer but there has not been a release of the resulting update yet. The reason for that is the new memory allocator for Haiku is making app_server run out of memory, which makes it impossible to run the test suite for the WebKit engine through.
In the meantime, I built a test version of the libraries (with HaikuLauncher, the minimal browser used to test them until WebPositive is linked with them). You can find it here for 32bit systems:
If you have some time to experiment, give it a run and see if it fixes or break things. You can report problems on the bugtracker (dev.haiku-os.org) as usual, mentionning that you are using this test version. If there are not too much regressions or I can fix them, I will ship the release without waiting for that app_server fix.