When asked about mod support, Ryozo Tsujimoto told PCGamer that the team does not have anything to announce at this time. As for cross-platform multiplayer? Not going to happen.

I want to synch these up as much as possible, but as mentioned previously regarding title updates, the differences in versions between platforms may prevent them being completely the same time.

[Balance patches] will be a case-by-case situation. If we find bugs that are happening only on PC for example, or issues arising after a title update, then we would put patches out on each platform as soon as possible. If there was an issue common to all platforms, however, doing it piecemeal would be less preferable than fixing every version at the same time so that everyone has the same experience