Changes at Highbury and Islington roundabout

What a mess it is at the roundabout these days.
OK, so the old ugly Post Office building is to be demolished and a new station concourse is in the making, but a 'road modernisation plan' is also in place as is evident by the silly little lane dividers in the road and the traffic lights on the exits. The traffic lights at the Canonbury Road exit are particularly unnecessary and only serve to block up the traffic caught behind them*.
More info from Tfl and Islington Council.
I have also noticed that a few trees in the middle of the roundabout have X marked on them. Oh dear are they coming down?

Comparison photos of the train station from the 1900s and 2013. The lovely original building was bombed in WW2 and all that remains is a small piece of one column in the left hand corner.

*I have seen a similar measure recently put in place at the northern end of Wharfdale Road where it meets Caledonian Road – completely pointless as there is no other stream of traffic to contend with. Perhaps these expensive measures are put in place to further patronise those people who have not learned their Green Cross Code and are too busy looking at their smart phones?