There's no catering on GN services anymore (and hasn't been for a very long time, fairly sure FCC removed it towards the start of the franchise) and pretty sure its a similar story on TL, so they would definitely be bringing it in line with the rest of GTR.
When the 700s come in, does anyone think there could be a market for a trolley (outsourced, of course, to a company that takes on the financial risk) to operate on some services?
For the longest trips, and where in 8 or 12 car formation you still only need one trolley, I think there would be a chance for someone to make some money and provide a valuable service. Sure, people buy food and drink before boarding - but when you're on a train for over an hour, there's always a chance people want another drink or light snack.
Vending machines are of course a logical alternative.
Edit: Reading the latest Connections newsletter, can I just ask why GoVia would buy 600 iPads? I have nothing against Apple products - they're great, but come on, they cost a fortune and aren't exactly ruggedised. Surely GoVia could have bought a perfectly good Android based tablet for considerably less, offering the exact same features (which I presume are fairly modest) and 3G/4G connectivity. Indeed, I know they could!