A new season of Akatsuki no Yona would definitely be awesome. :'D
I really loved the potential of Witch Hunter Robin (the soundtrack was mega glorious, sheesh), so I really hope that it gets a reboot, but I know it's never, ever going to happen.
Saiyuki, too. It definitely needs a reboot (sans Burial and Gaiden), because the initial anime is so very trash, hahaha. I love that manga exponentially though, so.
And then a second season of OPM is definitely something I'm looking forward to. ;w;