@jomz Campaign progress won't be reset.
I don't advice on converting all Tokens to SM Coins just becasue of the update. Remember Tokens remain untouched in the upcoming version. Of course, feel free to convert if you need SM Coins right now to continue playing until the new version is out, but don't do it just as a preparetion for the update. Remember you could still buy Gold with Tokens afterwards.
You'll have to wait and see but I guesstimate it will be around level 135 or so.
As Kingblinks quoted me correcly, all the items will remain untouched in players accounts, that includes all Mythicals.
Last note regarding hackers.
This is off topic in this thread so I've ignored questions about here and will continue to do so after this. However, I want to be clear that we take this issue very seriously. We're fixing any exploit as soon as we become aware of it. Big part of finding these exploits is getting help from the community (pointing on someone and saying he's a cheater doesn't help us, help means finding out how its done and reporting it).
We've also assigned one of the senior developers with analyzing players accounts. Any account that will be obvious been using exploits will be immediately banned. Every account that we think was sold/traded/given from one player to another will be banned. This developer works independently from the design and community team, btw, so the identity of the account owner is not considered. Please do not continue to discuss this in this thread, there are plenty of other threads dedicated to this issue. I will not comment on this further in this forum topic.