Diamine Red Edition - Thunderbolt

I'm in love with this blue! I've always loved peacock-ish blues, yet they feel a bit childish and unserious for me. This blue-blue is deep and rich and the sweet spot! My previous favorite was Caran d'Ache "Idyllic Blue" which is excellent, but not as vibrant/saturated as Thunderbolt.
I've also got Faber Castell "Lapis Lazuli" which is a very exciting name for an ink -- remember in "Girl with a Pearl Earring" when Colin Firth sends Scarlett Johansson out to buy lapis lazuli (a rare and expensive pigment) and says to her, "My wife need not know about the lapis." That said, the Faber Lapis is third place for me. The heavyweight glass bottle is glorious, but the ink is not as saturated and less glorious than the Diamine Thunderbolt.
The Iroshizuku Asa-gao is also wonderful, but again, can't quite compete with Thunderbolt for me.

All that said, is Diamine Thunderbolt a limited edition ink? I seem to have bought the last bottle Yoseka had. Is that "last till we get more in?" Or "last" as in there won't be more?