They haven't really been pushed back per-se, we didn't anticipate releasing 0.99 in February (barring unforseen amounts of time); the renderer's nearing completion, and object folders too, so we're just looking into the new control system and some other stuff, hopefully it's all done in a couple of weeks.
There probably will be an intermediate build to solve some silly issues with the current build, but whether any of these features will be in it I'm not sure.