Some specs of the second-gen NUCLUN were reportedly leaked, reportedly revealing that the chipset will be an octa-core one, with four Cortex-A72 ones running at 2.1GHz and another four humming at 1.5GHz all working in concert under the big.LITTLE architecture. It's also claimed that LG will cooperate with TSMC on the development of the 2nd NUCLUN, which will reportedly be based on the chipset maker's 16nm manufacturing technology.
Apart from some of the alleged specs, certain rumored Geekbench benchmark scores are also tied with the NUCLUN. According to them, the chipset has scored a Geekbench score of 5392 points in multi-threaded mode and 1796 points in single-threaded mode. This puts it ahead of the Exynos 7420 SoC on the Galaxy S6, which has scored 4970 and 1486 points in multi- and single-threaded modes, respectively. Wow.
As usual, such rumors can be easily fabricated, so take this with a certain amount of salt. Until we got hold on more credible leaks and information, we won't hold our breath for this one.