What is it you were expecting to see? It was announced as an option so that's what it is.....although one that lists at an extra £600 Will be interesting to see what effect this has on used values compared with the 3 door.
First 5 door STs have just started to hit the roads now. The all new next generation ST is launched tomorrow, there will be some good deals on the current model. "Drive the deal" already has £4.5k off the list price of a new one.
I wanted to order a 5 door ST a few months ago. Had terrible trouble getting an insurance quote as as didn't appear on many databases. Still haven't seen any in the metal.