Apple doesn't have the resources to create a search engine. I highly doubt this is going to happen. Anything they create will be inferior to Google and Bing so what's the point? Are they going to force users to use the Apple SE? Because that's the only way it would 'succeed', otherwise users would just switch back to Google.
As has been demonstrated, creating a legit search engine takes billions of dollars and many years of development. Google has thousands of engineers who just work on search all day. This would slow down Apple's ability to innovate.