Hey pufZeppelin, i know that Kanger are saying that you can use the long stem coils with both protanks (all of them) as well as with the Evods. This makes it easier for vendors, as they have a one size fits all. Even the box says Kangertech Evod/Protank coils.
With regards to them saying that they're discontinuing the short stalks, i am unaware of that. I have just recently, as in a week and a bit ago, purchased both long and short directly from Kanger.
I didn't receive any notifications that the short stalk coils are going to be discontinued, although its not the first time i'm hearing this. But to be honest, i love em both, so either way i am happy