its cool that the game now supports arrows that go from top to bottom, so we can branch of in that direction, too.
In the advent research screen we have seen that is possible to have requirements set in a different 'box' and that the arrow extends over the border. The 90° turn for the current research screen with fancy background (that looks very good btw

is a cool move
Although it still seems that the requirement arrows only span two tiers. (or there are simply no techs with a lager span between individual techs ^^
I hope larger ones spanning three tiers or more will be availiable in the final release aswell