
Below is a brief overview of all the 2020 k2 snowboards.
First let's at the new boards for the 2019-20 season, and some old 2018-19 boards that aren't coming back with a 2020 model.
After that we'll look at a list of all the boards, ordered by the category they belong in.

New 2020 K2 Snowboards
The new boards for 2019-20 are:
Exiting 2019 K2 Snowboards
The 2019 boards that aren't returning with a 2020 model:
All 2020 K2 Snowboards by Category
I have categorized K2's 2019-20 snowboards below. This is according to the categories here at SnowboardingProfiles.com and not necessarily the same as what K2 categorizes them as.
Of course these are only broad categories as every board is different, but this is a rough guide.
K2 BEGINNER SNOWBOARDS
Men's
Women's
K2 PARK/FREESTYLE SNOWBOARDS
Men's
Women's
K2 ALL-MOUNTAIN-FREESTYLE SNOWBOARDS
Men's
K2 AGGRESSIVE ALL-MTN-FREESTYLE SNOWBOARDS
There isn't a K2 board that strictly fits this category, IMO, though the Medium and Afterblack could both be used for this style of riding.
K2 ALL-MOUNTAIN SNOWBOARDS
Men's
Women's
K2 AGGRESSIVE ALL-MOUNTAIN SNOWBOARDS
Men's
K2 FREERIDE SNOWBOARDS
Men's
Women's
K2 POWDER & SHORT/WIDE SNOWBOARDS
Men's
K2 SPLIT BOARDS
Men's
Women's
K2 YOUTH SNOWBOARDS
Summary
So there you have the 2020 K2 snowboards.
Basically everything from the 2019 line-up returning (except for the Joydriver Split and Northern Lite, which have been amalgamated into the unisex sized Marauder Split) - with a couple of new entries - being the Medium, Raygun Pop, Cold Shoulder and Marauder (split).
Whilst there aren't any new short/wide's (what K2 term "Volume Shifted"), K2 still have one of the larger collections of "Volume Shifted" boards.
I had the privilege of testing some of K2's 2020 lineup and I'll release my reviews for those throughout the year.