Why are you asking?
DD is fine. All children moved up for the last two weeks before summer holiday. So they knew the classroom they were moving in to, had their names on pegs etc already, and knew their new teacher a bit. So not too much anxiety about the change.
I prepped DD over summer regarding 'there will be more work, less play' as DD had consistently stated that the best part of school was play time, the worst part was work time.
However DD now insists that she gets MORE playtime than in YR. Curious, I asked the teacher. I believe what is happening is that in YR things were very much 'free flow' with children playing at whatever they felt like, except when called out by teacher for doing a little work. Whereas now their 'play' time is much more structured. They get to choose, but from pre-set activities. Over all that means that most of their time is structured; but only a small minority is perceived by DD as 'work'. And because of the way the time is structured, she is much more aware of each time she chooses an activity (play). So it feels like more play to her.
Also I think that DD is one of those children who actually prefer some structure.
There has been a little bit of upheaval with children being given more responsibilities (e.g. children need to ensure they put their reading folder in the box in the morning) but parents not being told about this. So parents never reminded their children at drop-off, so it didn't work, and teacher had to take a step back and start checking/reminding the children again. If parents had been informed, most would have helped their children get into the new habit by reminding them, and soon it would have become automatic. But if school asks new responsibilities of 5-6 year olds, but do not inform the parents, then they have to live with the results, which may be that some of those 5-6 year olds are not ready for those responsibilities without having a little help first.
However, there is great variation from school to school as to how reception and Y1 are structured. Some will have a set-up like I tried to describe for our Y1 in reception already, others will have more free flow in Y1, and yet others will be completely different again. So I don't think you can really learn much from other people's experiences here.
As to what support we got, none apart from them moving up in July already.