I have posted an announcement on my website, I'll post the same info here
We've got 20x24 materials for around a year based on current usage, and talks are progressing to arrange future supply. I don't know anything about other formats, 20x24 is relatively easy since it comes on rolls.
Are the chemical pods the unique element with Polaroid? It would seem that the larger sized formats could be made to work as long as the pods are available. Are the papers (B&W and Color) available from other processes?