Short answer: there is! It only takes a while for Reason to update the graphical components.
The first time you add a specific device in the rack in Reason 12 early access, the panel, text and other graphical components may seem a little "blurry" at first. No worries, though. It looks this way until Reason has updated all the graphics for the device to hi-resolution. This is a fairly low-priority process (to not interfere with audio rendering and other important processes), but the graphics will gradually improve in real-time until you finally have a crisp and great-looking device panel.
The procedure is repeated every time you add a device in the rack for the first time. After this, the same device will automatically be in glorious hi-resolution the next time you add it to the rack.
The procedure is also repeated for every new Application Zoom level you are using.