When Amazon introduced the Ember Artline TVs in January , it didn’t have a specific date of availability to share. Now, the company is ready to supply the details: Pre-orders open today, and units ship on April 22 in the US and Canada, “with the UK and Germany to follow.” The company also announced a new version of its Fire TV Stick HD this morning, as well as some new features for its Fire TV software. For those who don’t remember offhand, the Ember Artline is basically Amazon’s answer to Samsung’s Frame TV . It’s a matte, 4K QLED panel that can double as artwork when you’re not watching TV, and to that end, Amazon is including more than 2,000 pieces of art for free. That’s also part of the Fire TV package that comes on the new Fire TV Stick HD, so you don’t necessarily need an Ember Artline to access them.…