Arthur,
In essence yes. MicroProfile 2.0 will be the first introduction of Java EE 8 specifications.
It also follows that any MicroProfile sub specs in 1.x will align with Java EE 7 and 2.x will align with Java EE 8.
The current plan is for MicroProfile 2.0, with just an update to Java EE 8 main specifications, to be released in 2Q 2018. After that point I would expect to see 2.x versions of sub specs that incorporate Java EE 8 features.
In terms of sub specs and 1.x vs 2.x work, there have been some other threads that touched on this. My perspective is that I don't see 1.x being developed in parallel with 2.x, but there may be exceptions if there is community interest in some functionality being back ported to a 1.x release of a sub spec.
Ken