So in that picture you've got a GTE (white) a GTI (red) and a R line (yellow).
The GTI and GTE are both from the performance stable (the latter some might question!) and are identically equipped in the UK already today, with only subtle differences like wheels, DRL's and tailpipes - I think there is a slight ride height difference too. This is the current situation.
The R line? I've no idea on the base spec, but like all Golfs you can add most of the bells and whistles individually that you see standard higher up the range. You can already buy an R line.
XXX line is something all manufacturers have been doing for some time - its a 1.1 engine but with their turbo-nutter body kit. I want to say Vauxhall were the first into the XXX line idea, but I could be wrong.
Its all just simply about trying to squeeze the maximum cash from punters...