If you're coming down I-380 from the North you will still have to exit on the loop to I-80 East, same as it's always been. If you're coming from I-80 from the West, the lanes are all open and there really isn't any change.
Either way, it's not appreciably worse than it was before the construction started. I think by next year, there will be a new I-80 East exit ramp when you're coming down I-380 that will be a huge improvement; no more backing up of traffic trying to exit onto that ridiculous loop. As Chickenlounge said, I think this goes until sometime in 2024 but they appear to be getting fairly close to getting some of these ramps open pretty soon. We'll see.