BITE
Yes, 4 overwing exits. They will use the centre section of the A320 to achieve this.
I understand that any new aircraft in 737 / A319 style (door at each corner, plus overwings) needs 4 overwings if it is to achieve more than 145 seats. Boeing overcame this on the -700 by redesigning the overwing exit to the pop-up type (used on all NG's).
Older types (-300's) are exempt from this 145 rule based on 'grandfather rights'.