I kinda doubt Obama is going to bodyslam Trump by name, and he probably shouldn't. As noted, Trump craves attention and no one mentioning him by name is probably giving him stress. Obama is not a pugilist. He has always appealed to our better angels and so he will talk about what's at stake and Hillary's qualification for his job. He was her boss after all.
Leave the muckraking to pit fighters like Warren.
It's like Voldemort.