The Anbernic RG353V should be out pretty soon. Personally, I'm on the fence with this device but still keeping an eye on it. A new short video has been posted by Anbernic showing off the device (YouTube video below).
My main concern with the device despite being being a huge fan of vertical devices is how two low thumb-sticks don't look all that comfortable. We'll have to see how things work out. I think I'm a lot more interested in the upcoming Ambernic Mini that looks like a big Miyoo Mini.