The Scottish government has issued a memorandum (HERE) in the Scottish parliament advising MSPs to block the EU Withdrawal Bill. The devolved administrations will have to consent to the bill when it comes before them because it affects the devolved powers.
The same instructions have been given in the Welsh Assembly too. However, don't get you hopes up, this is not going to stop Brexit but it will mean the government having to make changes to the bill and give up some of the powers they want to have for themselves. It just makes life a bit more difficult for Davis and May.