i doubt they will release new springs
the greys work well and they know it, we all know it.
so there is no need for another part.
ive never seen anyone run softer than the grey anyway
well with the rear shocks being so much longer a longer spring will be needed. it will probably stil be GREY just a longer version. I have seen much softer springs than the greys used. on a tight, smooth indoor track grey is much too soft.