This will be quite short because there is not too much to say at this point, but the High Court has ruled that only Parliament has the constitutional authority to initiate the withdrawal of the UK from the EU under Article 50 of the EU treaty. Needless to say, this is a major defeat for PM Theresa May and the Brexiteers. The government says it will appeal, and the hearings for the appeal will happen in early December. You can check out more details at the BBC or The Guardian.