I both understand and am surprised about the lack of updated Character Sheet for Unchained.
I understand because practically everything in the book is designed to be used in a 'plug&play' of as little or as much as you want. So that causes a large variety of possible sheets.
I'm surprised because the biggest things I'm sure that players in my area will most use that would require a new sheet are the Skill rules and Skill Unlock.
The Hero Lab character generator can make standard or custom character sheets for Unchained classes (if you have purchased the update, along with the basic program). It can also incorporate any Unchained options you are using for other classes. I like the way their character sheet is laid out, though it has been a long time since I have printed one (just send it to my tablet, or generate it on the tablet).
I agree though, there should be a free PDF from Paizo for those who prefer a paper or PDF character sheet.