Z4 New motorization

Hi Zettis, since I’m about to get a new Z4 3.0i SMG (currently I’m driving a Honda S2000), the question arises whether I should wait for the new 3-litre engine, which is already available from September in the 6’er and next year in the new 3’er. Does anyone of you know when the “new” will be about the release date or does someone get even more internal BMW information about the release date? Thanks already in advance, Pepe