I wasn't aware that this film had been re-made but after watching the trailer from it on the Yahoo! site I think it'll be well worth a watch. The trailer can be viewed here. The original 1979 TV mini-series starring Alec Guinness was just superb, and not in the least because it was a time when the Cold War was still strong. Anything else will have a lot to live up to but this one might just be able to do it.
'Tinker, Tailor, Soldier, Spy' is released in the UK on 16th September.