Formal notice has now officially been given to exit the EU with the triggering of Article 50. There is now a minimum period of 2 years before the UK finalises its exit negotiations. If this period is not extended (which can only happen with unanimous agreement from all EU member states) then the UK will formally exit the EU on 30 March 2019.
Any future immigration requirements for EEA nationals in the UK will depend to some extent on the agreements negotiated, which are still to be decided. The government has indicated that any new immigration arrangements implemented may be a phased process.
EEA nationals continue to have Freedom of Movement (providing they are exercising their treaty rights) until 30 March 2019. The UK government have not yet confirmed the position of EEA nationals working in the UK post this date.
EU law allows for a right of Permanent Residence which is widely expected to be replicated for existing EEA migrants under UK law
Currently the position is less clear for this group and further details should be released throughout the negotiations
The position regarding those arriving after the trigger date remains unclear
Individuals who have held Permanent Residence for a period of 12 months may be eligible to apply for British Citizenship, but should confirm what impact this may have on their tax position and any dual citizenship before considering an application. EEA nationals who have been exercising treaty rights in the UK for at least five years have the right to apply for permanent residence via an EU Registration Certificate.
Yes and employers are under a duty not to discriminate against workers based on their nationality. If new immigration rules are introduced, workers will then have to discuss these with their employer to establish if they meet the requirements and what impact that might have on their employment status.
UK nationals will be able to continue to work freely in the EU until a formal exit date. The position of those already living in the EU and those who wish to move post a formal exit is still unclear and will be decided by each country or EU wide depending on the final trade agreements.