I had previously forgotten to mention this, but the long awaited Mount and Blade 2: Bannerlord is coming out this year (after having been announced in 2012). Having sunk plenty of hours into Warband, I am very excited for it and can't wait to try out all the awesome new systems they're adding. Siege weapons and weapon customization are some of the things I'm most looking forward to.
If you're not familiar with Mount and Blade, it is an aged and clunky, but incredibly fun and addictive medieval action RPG/simulator with tons of freedom and a thriving mod community. Highly recommend trying it out, specifically Warband, as it's just an improved version of the original game.