Core i7-8559U Coffee Lake (14 nm) quad-core with base clock of 2.7 GHz and Iris Plus video. This would likely be a 28 Watt chip though, not 15 W for the 13" models.
According to other leaks, the i7-8559U is indeed a 28W quad-core CPU with an Iris Plus 650 - perfect for the Touch Bar 13" MBP. The dual-core Cannon Lake part is also interesting, since this would be the chip for the next 12" MacBook - didn't find a lot of rumors on this very part yet. However, for the 5W Core M CPUs, it seems like Ice Lake is the real upgrade there.