First possible hump in the Parliamentary process of Brexit tomorrow:
http://www.bbc.co.uk/news/uk-politics-39121562
The Lords might send it back to the Commons in order to seek assurances that EU citizens will be able to stay. I think this is something that is likely to happen anyway, it's more a soft protest to show some resistance. I can't see a scenario where this doesn't happen. It's too expensive and logistically difficult to deport all EU citizens, businesses would hit the roof and the uproar would be difficult to deal with. I think you would even see large scale protests and resistance. Imagine the police trying to rock up one morning in South Kensington to deport French citizens, not gonna happen.