Read more at source.
Read more at source.
Valve has yet to formally announce this feature, but it has been noticed by both Eurogamer and PC Gamer, and first highlighted by SteamDB. The feature manifests as a warning on the store page of an early access game that hasn't been updated in a while. For instance, the store listing for 'Cavern Kings' flags that its developers have not updated the game in over eight years.
While the feature provides a valuable heads-up for potential buyers, it may not be entirely foolproof. For example, 'Heartbound' by Pirate Software currently has a warning for not being updated in 13 months. However, the developer posted an update note in January explaining the hiatus and released a patch on February 1st. This suggests that the feature may still require fine-tuning to accurately reflect the status of games in the early access program.
If the devs' lofty goals for a 1.0 release were a little too lofty, then it's probably time to do some due diligence before spending money on what may be abandonware.