A brief update...
I received my new Rebel SL1 yesterday from B&H. I got the kit that included the new 18-55 STM lens, and the new center-pinch lens cap was included (58mm).
I also got a new Canon 55-250 IS lens from Amazon, and it also had the new 58mm center-pinch cap.
So, it appears that with new stock at least, Canon is including these new caps!
That's great news, maybe on my next clean and check ill send my gear in capless and see if they will do me a solid