I think they are being vague, because they are waiting to see what happens in other countries. It seems to affect children very little, so I suspect the social distancing will be between adults, with staff being expected to distance from each other and possibly wear masks, but children being pretty much left as they are, apart from possibly a smaller class, shorter school day/week.
I think it's unlikely anyone expects to keep toddlers apart, which is why creche and childminders may end up being the guinea pigs in all this - well the second wave of guinea pigs, nurses and nursing home staff were the first wave.
There is no easy answer, but I suppose at least if parents have to stay home that'll be one way to keep numbers in workplaces down enough that people can social distance at work.