Steam will force developers to be transparent about their season pass plans

"By offering a Season Pass, you are promising future content. In the process of launching a Season Pass you will be asked to commit to a launch timing for each content release in the Season Pass. That launch timing is a commitment to both customers and Steam. If you aren't ready to clearly communicate about the content included in each DLC AND when each DLC will be ready for launch, you shouldn't offer a Season Pass on Steam."

"Steam documentation now states that when a season pass is made available for a game, it must list all of the downloadable content (DLC) included within that purchase. Developers will also need to provide an expected release date for each DLC."

"In cases where a season pass is canceled, customers must receive a refund for any unreleased content that they have paid for."

"Delays are common in game development, but Valve will only allow a studio to reschedule a season pass' release date once; if more changes are needed, Valve has to get involved with making that change."

Read at Engadget