Can't tell whether my graphics issue is the same, but the descriptions seem similar.
Post-Fall patch and pre-hotfix, I was able to play DX11 on both my home rig (fairly high-end graphics) and my traveling laptop (running low/minimum graphics). Hotfix came out while I'm traveling (happy Turkey Day to all!), and now I can't play DX11 on the lower-end laptop because someone has overlayed ugly colored multi-lane superhighways (or maybe stacks of steel rebar?) across my map. Screenshot attached, but the graphics bug applies whether I'm loading a large save or starting a new game. Runs fine in strategic view and in DX9, but I don't care for either.
Won't be able to try it on my home rig until Sunday, but would be nice to have a solution to this.
I'll try updating my graphics drivers (again) and will edit my post if that fixes anything.
EDIT: Latest Intel graphics driver seems to have fixed my smeared "graphic superhighways" issue in DX11. I'll report back if my optimism is premature.