So Control-IQ+ has 2 main changes that, not only is discussed in press releases, but is part of the update training.
First, the ability to set a temporary basal rate while CIQ is enabled. Previously, this required turning off CIQ.
Second, the ability to do an extended bolus up to 8 hours instead of just 2 hours.
But there were also notes of nebulous “algorithm adjustments" with no details. I think I've run into it being a bit more aggressive to basal rates in response to BG climbing. My BG tends to climb many hours after having some wine (alcohol effect on liver, etc), usually while I'm sleeping, and sleep mode doesn't allow automated correction bolus, so only allows basal rate adjustments. I noticed in the visualization that basal rates looked more aggressive and the high BG didn't last nearly as long as it had in the past.