Gearlog made an autofocus test with the new firmware 1.1. Their conclusion is that there are no remarkable improvements. Focus Numerique also made a test (french). English google translation is available here . Their conclusion: “In AF-C mode, the autofocus does seem more responsive and especially in video mode, the problem of pumping and loss of focus was not resolved“
A more simple test has been made by Lucifer himself
thanks to noisycameras for providing the links!