I just finished episode 1, great story so far. Keeps you wanting to see what's going to happen next. I like how your decisions can directly alter the outcome of events down the road. I'm most likely going to pick up the remaining episodes soon
Anything you have downloaded or saved to the cloud are attached to your account so you are good there you will just have to re-download that stuff again as I'm sure you know
As far as preview I don't know for sure and don't want to give you bad advice on that