See, your experience was different than mine. I think it is a great idea for them to know how, just sharing my experience this past year. I'm sure you could offer up a lot more since he is the 7th one going through kindergarten. My son was 4 when he entered and turned 5 the first week of school. There are different curriculum depending on where you live, but by the time they graduate high school hopefully they will all be on the same playing field. No offense taken, just giving my opinion.
No biggie, I just shared a bit of two huge packets given to us when we registered our son. My son also knew all of what was on this list plus the activities they gave for June - August. However, he needed the practice on some of the things we didn't do often or that they didn't emphasize in preschool - like cutting on a dotted line. When we would rhyme he would get stuck on using words that started with "J", "R" and "S" (I think) so I needed to expand his horizon. I remember when I started school I really wasn't expected to know anything, including the alphabet. I definitely didn't know how to write my name. You would be surprised how many students, older than my son, that didn't reconize any numbers or could only count to ten. He knew how to write his full name plus all the letters in the alphabet - other kids really had a problem with it half way through the school year. When they tested the kids for jumping on one foot, bouncing a ball, and other things we take for granted, many of them failed. I felt really bad for them.
The love of learning and wanting to be a sponge is so awesome! I remember at the first progress report time the teacher explained that the kids were not graded on the level they are at, but at the progress they have made since they started school. I think it is great that they are doing the workbooks over the summer. What happens if a student doesn't get the workbooks?
The only other thing I could add is if your child has mastered all skills needed for kindergarten, try reading BOB books - there are three sets and most kindergarteners should be able to read them all by the end of the year. Of course if your child is ahead of the game, then they will be in teh advanced centers and will be tested for the advanced program come 1st grade.