Since the ArcPro SDK is built on top of ArcObjects I'm wondering if we built a standalone 64bit application using the Pro SDK will we run into the same memory constraints as we would for a 32bit application or does the Pro SDK take full advantage of the 64bit memory space.
The ArcGIS Pro SDK is not built on top of ArcObjects instead it is using "64 bit Engine level ArcObjects" somewhat similar to what "ArcGIS Enterprise" (formerly ArcGIS Server) is using. Also currently we only extend ArcGIS Pro through Add-ins and Configurations so it's not possible to build a standalone 64bit application using the Pro SDK with the exception of a minimal functional subset demonstrated here: https://github.com/Esri/arcgis-pro-sdk-community-samples/tree/master/CoreHost here is the ProConcept for stand alone Pro apps: https://github.com/Esri/arcgis-pro-sdk/wiki/ProConcepts-CoreHost