Well it didn't show this in the app, but it's now showing it when i tried to check in on the web page.
You are currently on stand-by.
You will be checked-in subject to seat availability. Please check your booking later or visit the check-in counter for updates.
Interestingly when i look at ita matrix they are selling for that flight! Hopefully all OK but would appreciate the advice on the reroute as I bought a C class business ticket.