Also I thought the Kanji used in japanese differed greatly since they use "only" about 2000 characters while Chinese seems to use 10 times more.
No. They're mostly identical, and you need to know around 1000(maybe even fewer) only to write natively in Chinese. I think apart from professors specialised in language, not a single Chinese can write more than 5000 characters.
Anyway, to be more on topic. I think Mother 2 is also a cult classic in Japan, so it would be odd to leave that out while including Earthbound in the west, considering that the first (until recently) and the third (is it still so?) games were not even released in the west. Maybe by swapping it with a Fire Emblem game they think there are enough RPGs already. Maybe also because of the numerous cultural references they just avoid re-releasing it so many times to keep them away from lawyers (AFAIK the western version was edited to reduce the potential for copyright infringement).
The same could be said for Panel de Pon, that having the word "Tetris" in the title alone makes it impossible to be re-released (unless they edit this out or just release the original Japanese game) in the west. This is a bit unfortunate, that the western edition comes with no puzzle game then (the NES/Famicom Classic at least had Dr Mario).
Another thing is that this time the console comes with two controllers (as opposed to only one in NES Class, and though the Famicom Mini had two controllers there were many other disadvantages as discussed earlier) and being able to play 2-player games out of the box is a selling point of it, but I think the current lineup is a bit lacking in multi-player games. The Japanese list seems to be a bit better, by including Goemon, Panel de Pon and Formation Soccer(I'm not very sure but I think these games all support using a second controller?). Do Kirby Dream Course and Super Punch Out support two players? Personally I think a party game like Bomberman would be great(maybe even replacing Formation Soccer).