This year Secret Cinema will be Empire Strikes Back. I would love to go but the price is just a bit steep for me (~£78/$116 per ticket).
It would be an experience though if any thing is to go by from last year.
I didn't go last year but saw the set piece for the Back to the Future (BTTF) in Westfield Stratford, London (I saw it from the John Lewis viewing window from the shopping centre). The Youtube video below looks like it was an epic event.
Video for last year's BTTF here:
Anyone been to previous events or planning to do it this year?