Yes. I'm hoping for a Q2/Q3 update just because it would be a year, but unfortunately there have been no Y series chip update leaks, except for Cannon Lake for Q4 2018, meaning a 2019 MacBook release.
The MacBooks wouldn't go quad-core until 2019. IF the MacBooks get updated in 2018 (and there is no guarantee they will), they'd most likely be dual-core.
As for the MacBook Air, I don't know. Maybe it will just get deleted. There will be an updated 13" of some sort, but it could also be a 13" MacBook or a 13" Pro. Furthermore, some have wondered if the non-TB would simply remain dual-core while the TB Pros go quad-core. That would be a viable product line, addressing multiple price points:
12" MacBook dual-core
13" MacBook Pro (?) non-TB dual-core
13" MacBook Pro TB quad-core
15" MacBook Pro TB hex-core