Has anyone successfully flashed the new firmware and kept their old settings?
Regarding the new firmware:
There is a box that you can leave 'ticked' to retain your settings. I flashed it and the settings are retained (as insurance, i saved the configuration file, which is easy to do: System tab, backup/flash firmware, the upper part is the backup/restore area - 'generate archive', after the 'setting archive' is generated you 'download' it to your pc)
Flashing new firmware is on the same System tab, backup/flash firmware, Flash new firmware image: leave the tick in the box of "Keep settings:", then simply follow "Image:" browse to the location of the image file (assuming that you have downloaded it already from Bitmain's support page), follow the prompts... There is an interim step that tells you what the selected image size is and the checksum, if you are happy with those click on 'proceed', then wait for the process to complete until your Antminer reboots and presents a new login prompt on the web gui.
Just did this and it works

Too early to declare results, but preliminary impressions are positive (nothing 'earth shattering' though).
Cheers