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Here they are (in no particular order).
Everquest Next - The first Everquest was a little before my time, so I missed out. This game is supposedly going to be the most ambitious sandbox game ever. Will it deliver on everything that's it's promising? Probably not, but I'm going to follow it never the less.
Marvel Heros - At first, I didn't want anything to do with this game, but I got bored one day and watched a video on it. First off, it's being headed by David Brrevik, and he's totally in his element. It's definitely a new spin on MMOs in a world where so many are alike. The Diablo-esque twist in a full-on MMO format interests me. Not to mention that each character is essentially its own class... and there are tons of them.
Greed Monger - This is a game that's running a Kickstarter campaign as I type this. It's about as far on the sandbox side of the spectrum as it gets, but it forgoes some of the more hardcore elements (limited FFA PvP/full loot, no permadeath). Now, that might turn some sandbox fans off, but I'm not super-hardcore, so that's really up my ally. I'm also liking the payment model; there is no monthly fee, and no cash shop. You buy land, and you can even resell it for real money (and the developers take a percentage). An original idea for a payment plan, and I hope it works out for them.
Citadel of Sorcery - This is another game on Kickstarter, however it's almost over, and it doesn't look like it's gonna make it. That's a terrible shame, because they have some really interesting ideas. The've generated an earth-sized planet, there's no level-cap, and it has some crazy-dynamic AI. They've been in development forever, and it's a really ambitious project. Will it deliver? Who knows, but I'm sure as hell going to give it a try.
Final Fantasy XIV - I was excited about this game once before, but I never actually got to experience it. I was quickly warned away, so I spared myself. I really want to believe in this game. They've reworked so much, including the graphics engine; it's still going be one of the best-looking games when it launches again. hopefully all of the feedback will turn it into a game worth playing.
The Elder Scrolls Online - Yeah, yeah, yeah; it's going to be the "next big thing", and I'm sure plenty of people are going to board this hype train and ride all the way to a bad metacritic user score, but still. As many of you probably already know, there was recently a flux of new info, including a release window. Before that, I didn't really give it a second look, but now that I know a little about it, I'm willing to give it a shot. It sounds like they're stepping away from the "standard formula", like many games are starting to do. So, not saying it's going to be the best thing ever, but I'm liking some of its features.
Darkfall Unholy Wars - I've spoken to a few people that liked Darkfall, but aren't too keen on it. However, they're pretty hardcore and are feeling like this game is going soft. Like I said, I'm not super-hardcore, so a slightly more timid Darkfall with some fixes to the highly exploitable system sounds like it might be something that I could get into.
Origins of Malu - Another indie game that launched a Kickstarter, but quickly canceled it, because they got funding elsewhere. Not a lot is known about this game yet, other than it's a huge sandbox. The thing that probably attracted me the most was that the players make their own factions. I think EVE works like that (never played EVE, so I couldn't say), but I like the sound of it.
Well, that's my list. What's yours?