For reasons I can't fathom they won't. However I understand that a limited group of railway staff can ride this week's (non-public) preview services for free if they have the required ID.
I know, I was one of them,
Managed to get get two return trips from St Pancras International to Ebbsfleet International with one of my colleagues who was showing me how good it actually is plus with the very kind permission of the traincrew got shown the inside of the cab and a little bit on how it works ,
You don't actually feel like you're travelling at 140mph, but you are - having said that you can certainly feel the acceleration after leaving St Pancras International.
Still the guard on the first trip must have been though the American customer service course ran by South Eastern for the route as I've never heard any guard that happy on his announcements!
Still I'm back on Friday and getting both Ebbsfleet International and Ashford International done 8)
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What's really strange is first thing this morning, I posted the above briefing on South Eastern offering rail staff the chance to take part in the live tests this week on the staff intranet only for a staff briefing to be sent out about 3pm containing the exact same stuff but only highlighting the stuff which said FCC staff could take part this week in the tests.
Still, by now all FCC staff should be aware of it - had to post it on the intranet after chatting to my favourite revenue colleague at Kings Cross who I've known for a while that although she was based at Kings Cross, they never heard of the South Eastern offer.