Today we have optimized game client and redesigned game loader to allow launching the game faster when large updates being deployed.
The game size is already over 1.5 gigabytes, but to start playing it is not necessary to download all of it right away. Therefore we have redesigned things so that to start playing you will need to download only around 1/10 of the whole lot to launch the game. The rest will be downloaded in the background while you play.
This is especially important for new players as we want to drive more of them into the game and don't want to scare off with large download times, however existing ones will benefit from lower wait times too.
However, existing players might see pixelated parts of the game like on the picture - this is not a bug, just a low resolution placeholder while actual art is being downloaded. When the download is finished in the background, it will be substituted with proper art.
Nevertheless, if you encounter black bars while you play, those indeed are bugs - report them and we will fix it.