Anyone been doing upgrades of ovirt engine + nodes from 3.1 to 3.2 yet ? what is the proposed upgrade path ? nodes first, then engine or other way around ? 

As the "domain" is a 3.1 domain currently, the nodes (HVs) would become disconnected from the engine if the engine was upgrade first ? Or, if you upgrade the nodes (HVs) first to 3.2 will it be able to run in a "3.1 compatibility" mode to still be controlled by a 3.1 engine, and when engine is upgraded to 3.2 will the node (HV) then switch to 3.2 automatically / or is a restart / reconfiguration required ? 

Is a upgrade possible w/o taking down the node / e.g. do I have to stop all VMs running on that node (HV) ? 
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