So I've noticed only 2 maps for each mode, and then lijiang tower as a tiebreaker... is this for the whole season? Is this all we're ever going to see? Because if so, that would be disastrous. It'd become so boring so fast.
All matches will consist of four-map sets
The map pool for the entire season will be announced before the season begins
Source:
https://overwatchleague.com/en-us/news/21108384/the-inaugural-season-explained
Based on what's on the overwatchleague website, the map pool is most likely going to change for the regular season and will be announced before the beginning of the season.