In #NextGenerationSequencing news, $ILMN Illumina has some more details on the website for the NextSeq 1000/2000 kits, now including a 100 cycle kit for the P1 flowcells, and the 600 cycle kits for P1 and P2. 
The interesting detail is that the P2 600 cycles kit gives 300M Reads CPF (Clusters passing filter), compared to the equivalent 300 cycle kit on the same flowcell (400M). So either the diameter of the wells is different, or about 100M Clusters are "lost" in the 600 cycle kit.
If the diameter of the wells is larger in the 600 cycle kit, this should allow for larger inserts, which would then benefit from being sequenced longer from both ends. This would make sense to me, but it requires manufacturing a different flowcell.
If the diameter of the wells is the same as the 300 cycle kit, then many of the inserts may land on adjacent wells while growing via ExAmp (or afterwards), thus increasing the number of duplicates and/or the number of non-clonal wells. Also, it could bias the sequencing of the
inserts towards the shorter ones, as the longer inserts would be more prone to jumping out of their original well.
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