I'm also very excited about this season's UCL.
Besides those two games, I heard that City vs Napoli, Juventus vs Dortmund, Newcastle vs Barcelona, and Bayern vs Chelsea are also a great matchups, at least for the 1st matchday.
Oh yeah, and this season's UCL is more unpredictable than the last one. Every teams are pretty much stacked, especially Chelsea and Napoli. These 2 teams can be a contender for winning the UCL after what they did in the last season, particularly Chelsea with the historic Club World Cup triumph, which many people thought PSG will easily win the final. And remember that lesser teams can still shine in this new UCL mode. Would be excited to see Bodo/Glimt having a perfect record at home (due to their own stadium being so hard to beat, especially during the winter condition) or (maybe) Kairat to get better results at home (because of away teams needing to travel for at least 10-12 hours to Kazakhstan, specifically Real Madrid).