Will more updated champion ability icons be coming soon?

So we got new Shaco, Gragas, and Lux ability icons very recently, and yesterday we got Cho'Gath's, so I'm curious at the frequency we'll see them in the coming patches. There are still quite a few older champions that need their icons touched up, namely: Fiddlesticks, Mundo, Udyr, Jax, Kennen, Anivia, Veigar, and Warwick (though if they're still considering getting his rework out at some point Warwick's can wait).

Any word on how often a new set will be released?