Caenen_
No, but they explored a Jax fix at the beginning of the cycle. /u/riotkingcobra may be able to share more about that.
The fix for Jax should be more similar to Master Yi. How he interacts with Rageblade on Live is technically correct in the sense that Rageblade's phantom hit specifically says that it applies on-hits twice and since Jax's Ultimate passive stacks aren't technically on-hits they don't get applied twice.
Of course, this doesn't match with player expectations because, for the longest time, his passive DID work with Rageblade's.
The fix is to basically make Jax's passive trigger on-hit and then slightly modify his tooltip so it reads as an on-hit. This functionally doesn't change how Jax behaves other than now he'll benefit from Rageblade.
The reason it wasn't included in this patch is that Jax's R is scripted in a surprisingly complex way and by the time that we decided on how we'd move forward we didn't want to make such complicated changes.