Saw this in Morrissons the other day. I hope this has not been posted already, but i did do a quick search before submitting this.
New pack size, as usually you get a 6, 10 or 24 can pack. Normal price £3.99, but with a saving of £1, it makes the price 25p a can. Which i think is one of the best deal around now, as i havent seen any better deals in asda/Tesco recently.