On 8th December, an agreement in principle was reached between the UK Government and the European Commission on the the first phase of the negotiations on the UK withdrawal from the E.U.
Apart from matters concerning financial settlements and the Irish border, there is more detail on protection of citizens’ rights including work, social and medical benefits.
The joint technical note agreed between the the two sides of the negotiations is at;
Although this is an agreement between the UK and the EU, it is likely that the provisions on citizens’ rights will also be applied by Switzerland. However, the full details will have to wait until the final settlement.