As div said there'll be squad changes, I'd imagine there'll be a change to the style of football we play in the top flight too. Although we've only had three league defeats (so far) they've all been by three goals, add in the heavy cup defeats to Thistle and particularly Aberdeen (which came in the middle of a good league run) and its clear we've a lot of work to do.
Still its not all gloom - as you say most promoted teams carry a bit of momentum and often a better team spirit than those who've been hanging around the Bottom Six for a while.
You just have to go with Doris Day - Que sera sera.