Bayern Munich is playing at home, so they have a very good chance of winning. It's natural that the betting market favors them with small odds, as it's well worth the potential.
Furthermore, Leipzig hasn't made many changes for next season, and many predict they won't improve on last season. So I don't think Leipzig can beat Bayern in their first match of the season.
Even if playing at Leipzig home ground it will not drastically change Bayern chances of winning, I am very sure they will still be favored by the bookies and it is important to remember that Leipzig has currently lost Sesko (their previous mainstay player) besides that they also have the potential to lose Xavi Simons, this will reduce Leipzig strength when facing Bayern later, so the safest bet is 1x2 on Bayern to win, furthermore this is the opening week of the Bundesliga so Bayern must pick up 3 points.