So many possibilities for the new series.
1.) His present day daughter doesn't know that he is her father and secondly that he is a time traveller.
2.) More back story on what has been happening in both time periods in the last 17 years.
3.) Reg could accidentally stumble into 2016, This would be hilarious, can you imagine his reactions to the modern world.
4.) Yvonne stumbling into the past
5.) Gary's son in 1962 could also have the power of time travel, even further back like when Gary went back to Jack the Ripper times (ONE OF MY FAV EPISODES).
These are just some ideas. The only one I wouldn't like to see happen is Pheobe time travelling or finding out the truth, not just yet, although I think somewhere down the line it could happen.
Also does anyone know the viewing figures for Friday's episode yet? I have watched it twice myself. lol.