Seeing it's delayed on PC, that might be the strategy, it's probably not though (
what ever the case, I doubt it's part of the Season Pass).
Looking at the steamDB here's some LQA update times (
going through update history starting from the release of a DLC, using Ctrl+F, you just need a steamDB login to go this far. Dates are by Australian time):
- Eurasia LQA: 6th of November (5 weeks from 13th of December release)
- Oceania LQA: 15th of August (5 weeks from 19th of September release)
- Arid LQAs: 19th, 22nd & 23rd of May (5 weeks from 20th of June release)
- Tropical LQAs: 14th & 15th of March (3 weeks from 4th of April release)
- Grassland LQAs: 21st & 22nd of November (3 weeks from 13th of December release)
- Twilight LQA: 23rd of September (4 weeks from 18th of October release)
- Conservation LQAs: 26th & 30th of May (4 weeks from 21st of June release)
- Wetland LQAs: 21st & 29th of March (3 weeks from 12th of April release)
Release seems to be at least the 3rd week after LQA update week. The time period for the next DLC release seems to be in the range of 29th of April, to the 19th of May.