Did you put his name on a waiting list for information, or actually fill in an application? We've had to fill in an online application through our county council to apply for a place in the nursery classes of local primary schools - we have to check online from the end of April to see if she's been allocated a place for September (we won't be notified by post). Then the clearing process starts once people have accepted or turned down places in early May. It could be very different in your area, though.
I found out about dd's place for nursery in a primary school via letter yesterday (she got a place ) but unlike reception places, nurseries don't have to release their decision on one particular day, but by may 10th at the latest