I'm especially excited about this new hybrid ULMW
I'm still getting familiarized with the C5 Haze but as far as i have experienced she is much more uplifting than A5 ... A5 is the 'dark' side of Nevil's NL5/Haze hybrids while C5 is the 'bright' one. I can recognize the C5 as the mother of original Jack Herer from the 90s (before adding Skunk to her) and i can also detect unmistikable Thai aromas in C5 ... not sure whether the Thai aromas come from NL5 or from the Haze side (or how this fit into Haze genepool used in these hybrids) but that's what i'm finding so far.
I've chatted for hours with Sammy about the traits of these hybrids from Nevil, and i think both agree nowadays that the A5 dark incensey liver aromas come from central american sativa genepool (most probably colombian), while C5 is a more Thai expression.
C5 x Kali China is one of the possibilities that immediantely came to my mind when considering to produce C5 hybrids with our genetics, another ones i have in mind as very desirable are C5 x Panama (already produced in seed form) or Zamaldelica x C5 and Thai x C5 also come to my mind as interesting future projects.