Okay it appears that you and several others have not read the preprint paper. The article's wording is a bit confusing but if you think carefully you'd realize that a later work can not be independent of an earlier well known result.
The article does have a link to Maynard's preprint: http://arxiv.org/pdf/1311.4600v1.pdf
Here is an expert overview of the situation: http://www.dms.umontreal.ca/~andrew/CEBBrochureFinal.pdf
"In April 2013, Yitang Zhang proved the existence of a nite bound B such
that there are in nitely many pairs of distinct primes which di er by no more than B.
This is a massive breakthrough, makes the twin prime conjecture look highly plausible
(which can be re-interpreted as the conjecture that one can take B 2) and his work
helps us to better understand other delicate questions about prime numbers that had
previously seemed intractable. The original purpose of this talk was to discuss Zhang's
extraordinary work, putting it in its context in analytic number theory, and to sketch
a proof of his theorem.
Zhang had even proved the result with B 70 000 000. Moreover, a co-operative
team, polymath8, collaborating only on-line, had been able to lower the value of B to
4680. Not only had they been more careful in several dicult arguments in Zhang's
original paper, they had also developed Zhang's techniques to be both more powerful
and to allow a much simpler proof. Indeed the proof of Zhang's Theorem, that will be
given in the write-up of this talk, is based on these developments.
In November, inspired by Zhang's extraordinary breakthrough, James Maynard dramatically
slashed this bound to 600, by a substantially easier method. Both Maynard,
and Terry Tao who had independently developed the same idea, were able to extend
their proofs to show that for any given integer m ¥ 1 there exists a bound Bm such
that there are in nitely many intervals of length Bm containing at least m distinct
primes. We will also prove this much stronger result herein, even showing that one
can take Bm e8m5.
If these techniques could be pushed to their limit then we would obtain B( B2)
12, so new ideas are still needed to have a feasible plan for proving the twin prime
conjecture.
The article will be split into two parts. The rst half, which appears here, we
will introduce the work of Zhang, Polymath8, Maynard and Tao, and explain their
arguments that allow them to prove their spectacular results. As we will discuss,
Zhang's main novel contribution is an estimate for primes in relatively short arithmetic
progressions. The second half of this article sketches a proof of this result; the Bulletin
article will contain full details of this extraordinary work."
EDIT: it appears that copying and pasting from the PDF is problematic and please read the linked PDF if interested.