Will 3.1.x extensions work on 3.2? Or will they all require an update?
This is usually why I hate not being able to update right away when a major phpBB release becomes available, since my sites rely a lot on many extension features.
extensions are the only one's I know of that will have trouble in 3.2. They will appear to work just fine, but will cause a blank screen or fatal error when they try to use the notifications system. The workaround is to not hit the Notify users button in BoardRules, and disable the Notify users options in each AutoGroup configuration.
There are updated versions of these extensions for phpBB 3.2, but they will most likely not be released at the same time as phpBB 3.2, but they will come ASAP.
will only have cosmetic issues with nav-bar icons in 3.2, and this too will be updated ASAP.
My Similar Topics ext will also appear broken in 3.2, but there is a new version coming soon for that too which will have it working in all versions of phpBB.
So, bottom line, if you got a lot of extensions, test out 3.2 locally first. See what may not work. DIsable any if you need to, or hold off updating phpBB until the exts that are a problem come out with updates.
There are no prizes for upgrading to 3.2 on day one. So take the time to make sure your board will work with what you're using first, and upgrade when it seems safe to do so.