This vagueness, according to Deadline, is because while Mitch Hurwitz has new ideas and lots of good material already in the can, he’s having to step back and work out how to use it all. There’s also the issue of getting the actors lined up and free of other commitments too so it may not be clear how much filming is actually possible.
The originally planned production period ran over, chasing new material, but paused at the end of last week. Next up, they should start rolling again in January, as soon as Hurwitz has worked things out.
None of this, it’s suggested, will effect the spring premiere date, wherein all episodes will be made available through Netflix, all at once.
It’s encouraging that Netflix are paying for this extra production – they already had the subscriber bait on the hook by promising new episodes of the show in the first place. It’s not necessarily going to bring in heaps more cash for them to promise fifteen episodes instead of ten, so, well done to the company for agreeing to Hurwitz’ desires to deliver more.