This November date comes up quite a lot ( a quick site search found lot of threads mentioning it), it seems to be something to do with DWP systems rather than an indication of when you wil be reassessed. Hopwever, you should expect to undergo preiodic reassessments for the duratin of our claim, these can vary from 3 months to 3 years.
Your money should not go down as you will get transitional protection, but it can go up if the Support Group pays more than youn were getting on IB.
Nothing on this board constitutes legal advice - always consult a professional about specific problems