I'm also going to be switching back to a monthly campaign, and producing things on a more individual level - such as just a tileset, or just a character sprite, etc - rather than trying to tackle big sets. I will still bundle things into Theme Packs for the purpose of selling and patron discounts, but this will allow me to keep up with a more regular release schedule.
Patrons are going to be able to vote for what I should add to the PixTana sprite library next. You'll also get to vote on what the milestone goals should be, whether that's tutorials, extra animations for sprites, or whatever.
In the meantime, here are the finalized NPC sprite templates to download.