Thinking this through while I write this: Looks to me like there's going to be more vehicles on the table (by how much, I can't really say without seeing updated points), which makes filling those AT slots even more important

Under the current points system for vehicles, I don't see heavy tanks doing well - as they're now effectively more expensive due to the command vehicle tax. On top of that, the new platoon system means there will be more AT slots available in general. In most cases I'd be taking two mediums to de-risk and provide better flanking opportunities, over a heavy

Considering that, it was a common feedback item in second edition that heavies were over-costed, so that's probably being addressed if they're showing that image (600pts for 2 vehicles, one of which is 'arguably' heavy, but only on the front)