2002. 8 years cycle lor. but primes can last for a decade and a bit more. lol...your 24-70 will definitely not be obsolete. no worries. its juz IS and non-IS...and besides the price will surely be ridiculously high for those who want the IS. =/ 70-200 f4 is and non is is about 1k diff. so i tink we shld expect the same for 24-70 is and non is. i don't think i'll pay like 3k for a 24-70 IS. it will be a VERY expensive walkabout. i'd rather choose the 24-105 IS over it. i think now i'm in love with primes though...haha! but primes is cost inefficient and its ridiculous changing lens while walking about places like orchard road. imagine the dust!