Here's what I've noticed from playing yoshi as far as nerfs and buffs go.
Nerfs:
1. Dsmash does same percentage but can't even come close to killing at 80% like in melee and that was an easy task to get someone up to 80 with yoshi.
2. His Fair meteor smash is ALOT harder to land, I used to use it as a sure hit and a shield breaker now I hardly ever pull it out unless I'm not above them guarding the edge.
3. His Dair does less damage but I only used it to kill off the edge anyway which it still does and now that it's easier to land every hit that's awesome.
Buffs:
1. My personal favorite is his Bair, it is seriously impossible to dodge all 4 tail wags and takes down shields like no other.
2. The Ftilt is so much more capable of repetition in brawl, it had more kill power in melee (200 percent thouh) but was not a reliable hit like it is now.
3. The Dair goes into a Footstool jump so easily it should be illegal, his is one of my favorite kill moves.
4. The Uair kills at 90% if high in the air at like Final D, but at like 100% it is almost a sure kill.
5. Every single special attack has been buffed, B> is so much better it has cancelled out falcon punches and leaves you in perfect position for a Fsmash and i've gone through one of pit's arrows and connected with him dealing 12 percent, the down B right next to an opponent will hit them up into yoshi as he plummits to the level, his Up B is a bit trickier when using in the air to do damage but I'd rather have the recovery than an attack i rarely used in melee.
Same awesome things yoshi always possessed:
1: Yoshi is still TOUGH, he's pretty much a tank character just without the size, I almost never die before i reach 200%.
2: Same power, his Fsmash can still kill at reasonable percentages.
3: he's still and edgeguarding beast, even more so with the recovery and no DJC.
4. Super armor during his insanely high second jump.
5: When being chased up into the air by a flyer like kirby or meta when they're going to combo more, just Down B them and being close to the ceiling i've killed at percentages like 60%.
Best of all, No one really practices against a good yoshi player so when they play you they have no idea how to approach, defend, or attack so after their defeated they have a look up astonishment on their face.
All in all I'd have to say yoshi is different and BUFFED, projectile spammers beware the new B>, flyers watched the Dair to footstool off the edge, everyone else his relatively good speed, power, and durability.