I think the trains will be on tyres on a concrete track. There will be provision for a station in the mid term but it won’t be built as part of this phase.
For the system to work seamlessly then it has to be ticket free otherwise it will lose much of its benefit. This can be achieved now if a passenger buys a ticket to Luton Airport rather than Luton Airport Parkway but passengers with through tickets still wait their turn to have their ticket checked before boarding.
If some sort of standard combined fare is introduced then anyone starting their journey from Parkway will be paying for a link that they will not use.
This rail link is being funded by the council rather than by London Luton Airport Operations Ltd or London Luton Airport Ltd. The general airport upgrade to 18 million passengers is being funded by Aena. Not sure why the council would be paying for this link rather than their 100% owned airport company who seem to be paying for Century Park.