@Joseph Wright in his answer to the post Why is LaTeX3 taking so long to come out? wrote that strategic goal of the latex3 team is a new LaTeX kernel, which should be more flexible than that of LaTeX2e (in particular, to avoid loading of add-on packages). 3 years went away since than. What is the current vision of latex3 kernel? There are more than 4k packages on CTAN. Perhaps, not more than 5 to 10% deserve to be included into new kernel. Perhaps, most frustrating thing (at least for me) it that explicit loading of some dozens packages result in loading of order of 100 packages since the most popular packages usually request lof of subsidiary packages.
My more narrow interest is which version of cross-referencing mechanism is planned to be implemented in LaTeX3? From what I am familiar with that of
zref seems to be more promising although user interface provided by the
zref package seems to be overcomplicated.