While there is still no ETA, given the available options, it would likely be on the order of weeks. There are still a couple of issues being investigated, and once the update is finalised it will depend on the nature of the changes how thorough the testing will need to be (if no critical issues are found, a full playthrough by QA would take a week for standard testing, to two weeks if additional permutations of main and side quest content needed to be checked). If the changes are all safe (unlikely to affect other systems) it would require less testing than if changes are made to story, or core components that do affect many systems.
