I've never been a fan of a separate battery grip either. The vertical controls weren't exactly the same as the original set, but the thing that bothered me the most was the flex at the BG/body joint. If it came with an integrated grip, then I'd be more interested. That and I'd rather not buy 2 L-plates or fiddle with taking the grip on/off so that I can use it on a pod.
An integrated design is lighter, stronger and more water resistant. That is an idea that I can get behind. And as for the size difference and being less discrete... how discrete is any DSLR with a 70-200 lens on it amongst Rebels with kit lenses, iPads/iPhones?
The least discrete camera on Earth is an iPad.
I assume you mean discreet, but I will admit that an iPad's camera isn't typically discrete, either.
Gosh...I can't even believe I did that!
I've seen iPad cameras move a bit more toward discrete, after a drop to pavement of the parent device.