At the moment there is no clear indication as to the level of qualification required. However, in theory if the qualification threshhold has not been reached, then it would not be possible to register. this would mean that limits would be placed upon what work could be undertaken.
I would assume that it will be possible to take the necessary courses etc to achieve the level required. This will, no doubt, also be the case for higher grades if they bring in a system of 'gateways'.