I found a brochure for the 4020 series at my dealer, which was no easy task. Not as elaborate as the brochure for the Ten Series, but the basics are there.
IIRC, I requested the 4020 Series from Deere.com and was sent the Ten Series produce literature after almost a month. I don't see a link for it on the site now though. Might be one of those subtle changes that we don't realize until we need to use it.
Seems odd for a new lineup, IMHO.