Well one thing is for sure,the new terminal extention won't be winning any design awards!.It still looks a mishmash of various bits added on over the years.Not sure about the glass roof part,would imagine it would be akin to sitting in a greenhouse in summer,oh I forgot, we don't have them anymore!.
Still I suppose anything is better than nothing,as the terminal was struggling to cope this year at peak times.For example when I flew in from DUS in July,3 or 4 aircraft arrived together,and the queue for immigration was the full length of the glass walkway,felt myself having a Victor Meldrew "I don't believe it" moment!