Nothing to stop Jamie racing in something else alongside W-Series, assuming there are no clashes (as she did this year - with Aston Martin at VLN for instance). I remain sceptical about W-Series, but let's allow some time to see what else the champ does next year.
Of the new entrants the one that interests me the most is Abbie Eaton - she was a fairly outspoken critic of the series when it was launched but has had a change of view, I'm looking forward to seeing how she gets on. I'm hoping that one of the two remaining spots goes to Esmee Hawkey, she's a better driver than she managed to show in WS last year - and one thing I will definitely credit the series with is that racing in WS has improved her driving in her usual Carrera Cup outings - she's faster, and racing better, in that championship than she has been previously, and just having the extra opportunities to go racing and get seat time with WS has played a big part in that IMO.