We can now drive to other places for exercise etc but only with members of our own household still. Being allowed out for unlimited exercise (from Wednesday) is the only real change announced. The workers he is talking about were in the group of businesses (such as construction) that were allowed to continue work anyway - provided they could maintain safe social distancing. There are no more shops or leisure/hospitality businesses allowed to be open than was the case this week at the moment.
I would have thought every employer would have been using the downtime to work out how they could safely re-open their businesses when allowed, whilst maintaining social distancing to keep staff (and customers where applicable) safe. Take B&Q as an example - they were never mandated to close their stores but did so until they could put a plan in place for safe social distancing for their staff and customers.
The media have been incredibly irresponsibly this week, and throughout the entire pandemic come to that, giving people the false impression that lockdown was going to be dramatically eased next week. Boris is being cautious, as he should be, and did point out that lockdown could be tightened as well as loosened if the number of infections and deaths start rising again.