I taught kindergarten. While there are no actual "official" expectations, (children can enter kindergarten with absolutely no previous learning experience), there are things that will help your child succeed. These are things that would be beneficial for a child entering kindergarten to know:
1. Numbers to 10 - higher is great, too.
2. Counting to 20 - again, higher is good, too.
3. Letter names - They will learn the letter sounds in kdgn, so knowing the names is really helpful.
4. Writing their name - and anything else. Don't be afraid to teach your child more than you think they should know. Challenge is great!
5. Writing the letters and numbers- - Make sure you know what style (print, D'Nealian, etc.) is used by your school, so your child isn't "relearning" letter formation.
6. Listening skills are key. Children should be able to listen to stories, directions, etc.
7. Following directions - multistep. Give your child 3 small tasks to perform and see if he/she can do it. (Ex. Pick up your truck, put it in the box, and come to dinner.)
8. Waiting for his/her turn - delaying gratification.
9. Patterns - ex. green/blue/green/blue
10. Classification and sorting - See if your child can sort objects and tell you how he sorted them. (ex. blue legos, green legos, red legos)
11. Tying his/her own shoes (This was NOT in the curriculum when I taught kindergarten. This skill was expected to be taught at home. It is MUCH easier if a child enters kindergarten knowing how to do this.)
12. Zipping/buttoning, basically taking care of his/her own clothing. (Do not expect a teacher to touch your child's pants to snap or zip. I refused to. Teachers simply can no longer touch a child in what could be perceived as an inappropriate way. Some teachers still do, but I didn't risk it.)
13. Separation from parents. (This is particularly hard for children who have never had social interaction with other children, such as day care, church, etc. It amazed me how many children had spent 5 years with only their parents, then were expected to handle going to school all day long.)
14. Knowing his/her full name, parents' names, address, phone number. (This is a safety issue.)
15. Taking care of his/herself in the bathroom. (Yes, I was asked to wipe a child once! I had to politely tell the parent NO!)

16. Familiarity with how to hold a pencil and crayons. Also, knowing how to cut with a scissors and use glue is important. All those are needed for fine motor work.
Wow. That was quite a list, huh? I hope that helped. Don't be afraid to challenge your child. Some children are beginning to read when they enter kindergarten. Don't be afraid to teach more than you think they need.