Yes there are popups, don't know what is annoying about that. Even if you never slide to hit the right button, it helps to verify that you are not mistyping.

Landscape keyboard is there.

It has incredible response times, so it can cope even with the fastest typists. Magnifying glass for cursor positioning (on long press).

Umlauts etc can be entered by pressing long on a key, but you can also switch to a different language / keyboard type on the fly by swiping left or right (you choose which ones you want).