I haven’t seen any specifics on the Kickr-related changes but first impressions suggest there’s a problem. I just did a single lap and the resistance was virtually non-existent. My normal time for a lap is on the 8 - 8 1/2 minute range. This one took almost 13 minutes Also, I was peddling like crazy up one of the hills (probably 120 rpm) and managing a whopping 4pm The folks I was riding with left me in their dust!
After this ride I did start Zwift and try again in case it was some one-off, but had the same again (no resistance).
All other aspects of my machine (Surface Pro 3) seem just fine, including a quick test with TrainerRoad which had no issues.