Two days ago, Snapshot 13w02b was released. This snapshot (along with 13w02a) contains a new rendering system for the entire game, having each block/item consisting of multiple texture files for rendering.
Right now I do not know of the stance of Risugami’s ModLoader (ML) on this change, if it were to adapt somehow or discontinue, because according to cpw (who does FML), this change completely break’s ML’s overriding system.
The mods possibly affected are all my ML (Forge compatible) mods: Back tools, Mob amputation, Mob dismemberment, Pig Grinder.
What I’m trying to point out here is that ModLoader may not work the same way in snapshot 13w02b when fully released (I assume it will be called 1.5, and will refer to it as such from now on), so it might break the mods in some way. However, if I have to take the step, I will be moving the mod to use Forge/FML rather (ML mods have always worked on Forge/FML).
On a side note, for those who use the Pig Grinder mod, I will be discontinuing it as a ModLoader mod, and will continue it as a Forge Mod (making it SMP compatible) in the future.
TL;DR: ML may be changing in 1.5. My ML mods may convert to Forge due to it. Pig Grinder is confirmed to switch over.