We've known for 12 months that there will be a quad-core 13", and recently we've known of the 6-core 45W chips not to mention the 6-core desktop parts. Its not a matter of 'if', especially today with the announcement.
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No.... It's only under 15W that is using Cannonlake. 15W and 28W were rumored to be 14nm++, but are actually a revised version of Kaby Lake. It is worth it to wait, but no LPDDR4 support so far, as expected.
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Yes, the first 4 have been announced but remember that it's not the entire lineup, there are more 15W models not to mention the 28W models. 28W will also be KBL-R. Personally I wouldn't mind either way because Apple could implement a 15W dGPU.
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The earliest we could see it is March, although the latest we could see it would be the end of the year, however we'll have new chips on the horizon then (it'd be like 2016 again).
Is it a certainty the 28w chips with better graphics will be quad core ?