Periodical snapshots of the Tangle are a normal and expected part of the IOTA network.

It is not a transition and it does not affect in any circunstance those who are yet to make their claims.

If you have not yet claimed there's nothing else you need to do but to claim before the end period, some months from now.

If you have already claimed, your iotas are safe on the Tangle as long as you keep your secret seed safe.

And if you are a IOTA early adopter, please consider running a IOTA full node. This way you will be directly contributing for the growth and the success of the project.