If you search around on YouTube, you can find tons of fan-made Doctor Who title sequences, some good, some not-so-good. A few stand out. One in particular, made by Billy Hanshaw and posted to YouTube last year, caught the eye of Steven Moffat. According to Space.ca, Moffat described the sequence as "absolutely stunning". Moffat proceeded to get in touch with Hanshaw and arranged for the sequence to be used in the actual series. The version that will air starting on August 23 is not identical to the YouTube version, but is apparently mostly the same.
It's actually a really good title sequence. Very original, and definitely far better than the title sequence from the second half of Series 7. Have a look!