Eastern's latest schedule update has Teesside still starting on the 7th September, but initially only once daily instead of twice. Leeds will remain once daily on that date instead of the previous increase to 3x daily, which always seemed optimistic.
Personally I'd much prefer to see the routes returning at lower frequencies than being delayed or not returning at all so I'm fairly happy with today's update. Teesside will add another daily destination on the departures board.