Finally I was able to try my new batch (all three flavors).
To be honest, I was a bit disappointed to feel the "oily film" back. The Coffee bars got rid of it, so I thought that was an improvement to keep.
Second, they looked like something "smashed" into the wrapper, not a properly shaped bar.
But I can live with those.
The problem is I think I prefer the old ones. This new ones remind me too much to the old Wunderbars (from another brand), the single most disgusting thing I've ever tasted (not that I found the new Jake Bars disgusting as those). Specifically, what reminds me of them is the new crunchiness and the overly sweet taste. I have a sweet tooth, but these are simply too, too sweet.
I did 4 per day with the previous ones, and no problem at all. But I'm not sure I will be able to do that with these new ones. I hope they'll grow on me during this month or I'm afraid I couldn't renew my subscription 
But there's some positives. Texture is great. Chewiness is great and they left me quite full (more than the previous ones, I think).