[Update 11/9 1:25p] The preview release is over here.
Okay, after looking at the massive amount of change in Terraria 220.127.116.11, looks like I'm going to have to completely rewrite RomTerraria.
Functionality mods can still use the Component architecture in XNA, but visual mods can't due to changes made in how Terraria works.
So, consider this a complete startover. I'll be using no code from the previous versions of RomTerraria. If you have any requests for features to be added to RomTerraria 3.0, consider this your place to request them. I'll also add in updates on requests as they come in.
Request #1: Make it Linux compatible. That's not something I'll be able to do. Terraria is tightly bound to XNA and Windows at the moment. Redigit did say that he was looking at a port to MonoGame, but was having too many problems and Terraria 1 probably will never come to Linux. [11/3: I did manage to get the server running without XNA, which is promising.]
Request #2: Key re-binding. Already exists. Settings -> Controls
Request #3: Ponies. Thread for reference. Will bring back the pony.
Request #4: Save map as PNG. Okay, I can do this one. Should even be able to hotkey it. One key for a 1px-per-tile version, one key for a full-size version. [10/5: 50% done. 11/3: Complete, but unstable, so not ready for release.]
Request #5: Allow inventory to be moved. This would be really tricky, but not impossible. The only downside is that you wouldn't be able to use the default inventory key, unfortunately. I'll look at it for vNext.
Request #6: Have wings and rocket boots consume mana. Working on it.
Request #7: No shadows. Not sure I can do this one easily, but I'll see what I can do.
Request #8: Full map reveal. Should be easy.
Request #9: Invulnerability. Can't do that, but I might be able to make it so enemies die when they get within a certain range of you.
Request #10: Server support for mods. Will look into this one. [11/3: Doable. I've got code that will allow me to inject hooks anywhere...and I do mean ANYWHERE.]
Request #11: Smooth lighting and Eyefinity. What's wrong with it? I'm running an nVidia card on a single monitor, so I need clarification on this one so I know what I'm looking for. [11/3: Complete, released.]
Request #12: Add the bunny from the collector's edition for Steam copies without registry mucking. [11/6: Completed, but removed from the mod because it would result in the mod being banned from the official forums for the game.]