From what I understand from the rumors, Intel won’t be integrating the TB3 controller into the Y-series CPUs until Ice Lake. So unless Apple uses a separate controller chip, which they haven’t done in any previous year, the MB won’t get TB3 this year. Hopefully Ice Lake won’t slip to 2020.
It seems like they could do a second port though and maybe upgrade to USB 3.1 Gen 2 for 10Gbps throughput instead of the current 5Gbps. What I’d really like though is a 14” model.
Doesn't the current MacBook Pro 13″ use a separate controller chip? The iFixit teardown seems to confirm this, but perhaps I'm misunderstanding the CPU support required.