If they are going to have school dinners, make sure they can ask for things they want clearly, a child crying because they don't like what they have been given can set the others off. Also, being able to use a knife and fork is very helpful.
With packed lunches, try and put things in they can open themselves. That they know how to handle things is good too, a Frube squeezed too hard can go a very long way,as can a juice carton.
Yes to velcro shoes, laces are a nightmare when there are more than 2 children that need help with them. If they are wearing coats with zips, practice doing them up themselves too, again doing up 20 zips takes most of lunchtime.
Pertinent to the weather recently, please make sure they know to wear a hat if it is sunny, and they know how to put their own suncream on if needed, I know of one little boy that took so long to put it on it was time to go in again.
If they tell you that xxxx isn't their friend anymore, is nasty, has hurt them, please check with the teacher before confronting another parent. A fall out at playtime is often resolved before home time, but they don't always remember to tell you that bit.