There was a big buzz that new Samsung is threatening BB10's launch.. Here is one expert's conclusion I copy and pasted here:
"The list of user interface innovations goes on, but they don't amount to a coherent new way of interacting with the phone. Nor do they turn the phone into something that's intelligently aware of what goes on around it. It's more like Samsung is throwing a bunch of technologies into the phone to see what sticks. Sometimes, that's how progress works, but consumers might not appreciate being guinea pigs.
The S 4 presents an interesting contrast to the BlackBerry Z10, which is coming out in a few weeks. Research In Motion Ltd. jettisoned the old BlackBerry software and rebuilt it from the ground up. The phone's hardware isn't as impressive as Samsung's, but the software is easy to use, and it's based on a strong idea: taking the pain out of communicating across email, text messaging and social networks. The S 4, unfortunately, doesn't have the same clarity of purpose."