The release notes suggest drivers can choose between two acceleration options, Chill and Standard. The former "makes acceleration more gradual" for a smoother, gentler rider for passengers. It's unclear how much this affects acceleration, but some users on Reddit say the change swings too far in the other direction. Still, it's a nice option for those that don't care for sub three-second 0-60 runs.
The other big update for 2017.44 is an exit mode, a feature available on a lot of other luxury vehicles. When set, the steering wheel and seat both adjust for easier ingress/egress. Once driver is situated, the wheel and seat move back to a preset position.