It is terrible, bring back the old colours.
It's much better, please don't!
I think it's safe to say the blue is gone as clearly purple is now the brand colour and differentiates it from Sky etc more, but the design still needs some tweaks.
Perhaps it looks less like a muddy brown-purple on out-of-the-box TVs with their colour, contrast and brightness settings all ramped up to retina-popping leves, but certainly on my TV with more modest settings and none of the image enhancements on it looks really drab, and as said text in the BT Player app is now harder to read. Too much bright purple would be quite jarring so I can see why they've gone for darker colours but there needs to be a balance somewhere.
And still nobody’s grateful for the positive change they asked so often for. Surely we need to encourage the programmers that they are providing just what we asked for. Maybe it’s just easier to complain than congratulate!
It's not the most adventurous of colour schemes but I find it clearer and easier to read, it's a change for the better for me.