This in summary from ANZ's latest piece on Brexit

  • PM May's statement to Parliament on Brexit plan B looked much the same as Plan A
  • Parliament to vote on it on 29 January
  • Challenges are expected

Probabilities:

  • extension to Brexit deadline 60%
  • 'no deal' probability 20%

For the currency:

  • GBP/USD could fall on growing risks of a 'no deal', dropping towards 1.20 or below

ps. the remaining 20% of the probabilities;

  • revoke Article 50 is 5%
  • cross party consensus for a deal 5%
  • withdrawal agreement 10%