I've plotted a couple of potential routes and neither of them are hilly. Can't avoid all the uphill stuff though because in and out of Leeds, whichever way you go, tends to be bumpy.
So far it's out and around York clockwise ot anti and it's going to be around 3000ft of up. Maybe.
I did a route out to the Humber Bridge and back which would have been nice but it came in at 130 miles

Give that a miss I reckon.
Like I say, early days. If it happens at all it will be around April I would guess. apart from more daylight hours and warmer weather (maybe) it will give partcipants a chance to get some miles in.