Some more details (Episode 2 was on sale for like a day):

https://kotaku.com/telltale-s-the-wa...een-1829329062
A spokesperson for Telltale provided the following statement to Kotaku on why the game was removed from stores and its future plans regarding episodes 3 and 4:

“Yes, we have removed season passes for The Walking Dead: The Final Season from stores for the time being. We’re currently still working to find a way to hand off production of episodes 3 and 4 so that the season can be completed. The outcome of those efforts will determine when and how The Final Season returns to stores. We hope to have a firm announcement before the end of the week. For now, we apologize for any inconvenience.”
The last two episodes were scheduled for November 6 and December 18, and achievements for both are available so that means the story is all complete. With only a month to go before the originally scheduled release date for Episode 3, I would imagine it's in a state close to completion. The fourth episode, the series finale, is maybe halfway done or so. Just guessing here. I'm also guessing if Telltale do manage to find a way to release these final two episodes, they'll release both at the same time.

Fingers crossed.