For issues you find with the Switch and Console releases, please follow this link and give as much detail as possible. This is the speediest way to get info to Pipeworks and get a hotfix in the works.
For issues you find with the Mobile 1.3 update, please follow this link and give as much detail as possible. This is the speediest way to get info to DR Studios to look at your issue. Also, some troubleshooting hints here.
It seems as if the wait for 1.3 is coming to an end (finally!). According to Pipeworks' twitter account, 1.3 has been put up for certification. Hopefully this means that the update will roll out 'soon™'
never mind, it was a...
Pipeworks have said that the hotfixes would be included with the update. The confirmation is below. If this means that more time would be needed is beyond my current knowledge.
If you want to stay updated on the 1.3 situation, I suggest checking out Pipeworks Studio's Twitter account. It's where they have been most active. Below is their latest 'update' on the 1.3 update for Xbox One: