I had the same thing, here's how to fix:
1. Connect your Surface Pro 3 to an external display (I used my TV using the display port)
2. Run windows update from All settings/Update & Recovery/Update
3. Restart the Surface (KEEP THE EXTERNAL DISPLAY CONNECTED!)
4. Go to Intel's website and download drivers for the graphics - Laptop/HD 4200/Version ending .4080
5. Restart the Surface (KEEP THE EXTERNAL DISPLAY CONNECTED!)
6. Log into Windows and then disconnect the external display, Tada!!
The final step is optional, if you're like me and find almost no apps work, revert back to 8.1 and wait for the Consumer Release.
Hope this helps!
Thanks,
Iain.