Here is a quick summary of what this non-brony mod posted. The actual screencaps will be below the break.
1.) See what spike is doing? That's furry. And bannable now, even if it is pony.
2.) Reaction images are fine, as long as they aren't used to derail something. (This thread is now ponies for example is banned)
3.) Ponies are not Alternative Hentai, and no longer allowed on /d/. (but shitting dicknipples is still all good, and encouraged)
4.) Mods will ban pony on /b/ when they feel like it.
You can find all of the mod's reactions to various questions below the post break