An early reader series that is enjoyable for the parents too is the Elephant and Piggie books by Mo Willems. My DD (age 4) still adores them although her skills are far beyond that reading level now. The library had most of them. Now the 2 year old is addicted :-)
As far as keeping their interest in trying to read, I liked to alternate pages where she reads then I read. Or, have her pick a character to read, like a play. If she really wasn't in the mood, I'd read aloud myself.
I do worry about how much the teachers can differentiate their instruction in K, I guess we'll see...
