Talking of Seats, looks like we're not getting the sporty bucket option according to the configurator...
t=1m30s
The Bucket seats as a standalone option and other options including a larger range of colours are expected to be available around June/July, this is rumoured to coincide with the 'performance pack' option being available in the UK (Brembos/Buckets/interior trim highlights/bespoke 19" wheels and Pilot Cup2 tyres) 
Back off topic again, I just picked up a Leon brochure (they didn't have a Cupra in stock

) and it says buckets are available from July onwards. No mention of any other go faster bits, though.