I wouldn't touch it with a 39 and a half foot pole. I've seen Kirby's Epic Yarn and I know they took his power stealing ability. I've also seen where they made it so Yoshi doesn't make eggs. I know at one point Kirby didn't steal powers and I know in Yoshi's first appearance, he didn't make eggs, but they became a staple in their respective series. Getting rid of those powers lessens the game.
In the game play video Yoshi has eggs not sure what you saw.
[youtube]https://www.youtube.com/watch?v=fmcdlmr6beo[/youtube]
He ate an enemy, but there was no egg.
Those are the old videos from over a year ago below is the game demo at E3 a few weeks ago.
https://www.youtube.com/watch?v=EpqXwiVHhB8#t=114
Besides, just because the graphics style is similar to Kirby's Epic Yarn, doesn't mean it will be exactly the same. I rather enjoyed Kirby's Epic Yarn despite not being able to steal enemy powers. You do plenty of other things, it wasn't something I ever missed.
In any case, my answer was Yes. It would have been HELL YES! had there been an option. Been waiting forever for more news on this, I'm really pleased with how it's looking. I love the laid back Yoshi games, and this'll be a blast.