Either a lockdown, or a lockdown in all but name, yes.
It will be announced later this week, my guess is Thursday as he won't want to announce it on Christmas eve. It will come in at some point next week (he will need 48 hours to recall parliament so they could sit on Friday, or more likely the Wednesday after Christmas), it will probably last until at least the end of January. My guess is hospitality and entertainment venues closed, home schooling and work from home for January (or longer) and restrictions on meeting other households indoors.
People will comply with hospitality being closed, because they have no other choice, but they will ignore the meeting other households rule, in a lot of cases because of the behaviour of the Johnson regime.