If BMW follows their usual cycle, all models get a re-freshening after 4 years. Then about 2 years after the slight (but almost always better & noticeable changes) a new model will debut. Once in a while (as in the case of the 7 Series and X3) changes are made before the 4 year mark, if sales are really low, or there are a lot of customer complaints regarding materials, craftsmanship, electronics, etc.. BMW did a lot of 5 Series interior upgrades, before the official 2008 "face-lifted" 535i & 550i came out, as the 2004-2007 5er had rubbish interior materials.
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