He did a lot of it in Summer League, so it seems like something he's been working on to add to his game. Whether that's him or the coaches obviously it's a smart move. He has such a knack for getting to the ball under the rim, he's so strong and agile, that anything that puts him, with the ball, near the rim is probably going to turn out well. lol
Imagine playing a big lineup of Duncan/Splitter/Diaw, and Kawhi taking the other team's two guard to the block 5 possessions in a row. I don't think Kawhi has any trouble D'ing up NBA two guards, so it'd be like a guaranteed two baskets and then a time out by the opposing team's coach. Now that he's back he can actually start working this stuff into his game at NBA speed, then we'll see how much of the hype is justified (I'm thinking a lot of it

)