From the Illumina press release
HiSeq 2500 chemistry enhancements empower the industry’s highest daily throughput and drive down the price of whole-genome sequencing. With support of paired 250 base pair read lengths in rapid run mode, the HiSeq 2500 will be capable of generating up to 300 Gb in rapid mode with sample to data in less than three days. These enhancements will be available in the second half of this year.
What will these much longer read lengths enable in terms of improved analysis?