We have officially started working on this and are aiming at releasing this before the summer.
We will still be looking at feedback given here to ensure that the experience will suits your needs.Terry Mc commented
This is going to be a 'must have' feature soon. Microsoft is all in on Teams, and many organizations are as well.
So far, from what I can find there is no supported method to move Teams from tenant to tenant. What little can be done is quite manual and misses all the channel and chat conversations.
I put in a support request in O365 and was told by MS representative that it was not possible at this time.
I've been tasked with helping to move our O365 tenant after an acquisition and have run into a brick wall with this.