I don't see why they would give them for free to warrentied users, it's not like the current knobs are broke.
No, but Elektron could ship all new MD's and MnM's with the new rubber-type knobs in future (they may already be planning that?). I think it's a good idea, and we just pay for the shipping.
Re:Sweet, new knobs for the MD and MnM! 13 Years ago
That was the first thing I thought about too. It seems like the rubber with soak in the oil and dirt from your hands after a while and stain a bit. They do feel nicer though.