I've never seen it specifically announced but all indications are that it will be TS. No idea if they'll have a carryout window or anything like that. The pizzeria run by the same company at
Disneyland has both TS and CS serving components (small area for takeout) but Disneyland does not have the same dining plan as WDW and people can't use dining credits there.
I know that when this is asked, it's mostly by those who are hoping they will get to use CS dining credits for pizza at Via Napoli in Epcot. There's no way to tell if you'll be able to do that yet. There's nothing released about how or even if they will incorporate the dining plan. Via Napoli won't be owned or operated by Disney so there's a possibility (albeit a small one) they may not even accept the dining plan.
The Disney blog did post that it would be available for reservations, so it is likely it will be a table service location.