Okay, so, as you may have heard by now, it appears that vectoring has been removed or at least significantly weakened in 1.0.4. Previously, you used to be able to hold up and mash jump to escape the situation whenever Yoshi did DThrow, but this seems like it is no longer possible. This makes Yoshi's throw game much more dangerous.
Despite the removal of vectoring, Dthrow to Uair still isn't a true combo on most characters, the opponent can mash airdodge to get out. However, it is now a very dangerous 50 / 50 between Uair and Dair. Uair will beat double jump, and Dair will beat air dodge. Note that the risk / reward on these moves is not the same. Uair does lesser damage but the risk is less, if they guess right with air dodge you're usually safe. Dair hits much harder, but if they guess right with double jump you're usually punishable. However, therein lies the game. The opponent knows Uair is usually the "better" option, so they'll attempt to dodge that more often, and you can sneak your Dairs in. Dair is a great demoralizer, too, it hits super hard and it just feels terrible to get caught in it, so it'll make the opponent wary of air dodging the next time, allowing you to land your Uairs.
There is also a third throw follow-up, which is just to throw an egg. Like Dair, this can be timed to beat air dodges (it might even beat double jump in some situations). However, this is a much lower risk / reward option. It's generally safe to go for the egg, but the reward is quite low, it doesn't do much damage if it lands. However, this does have the important property of preserving stage position. Against characters who have difficulty landing safely this can be a powerful option, too.
In general, I feel like with this system change, Yoshi is way scarier than he was before, as his excellent grab is now quite dangerous, and he may be a legitimate top tier character now. Of course, it remains to see how this change will affect other characters, who will also no doubt gain more true combos and mixups.