The information is taken with big tweezers but according to a rumor, a remaster of Diablo II is in development.
see also: Diablo 4: Income from Darksoulisation, it should be close to Diablo II
It has been a while since a hallway noise has mentioned a remaster potential for Diablo II. In fact since the announcement of StarCraft: Remastered the Blizzard community is very demanding on the subject.
Well according to the site ActuGaming
It remains to be seen whether Blizzard will confirm this information or not. According to other sources from the same site, we also learn that 3 mobile games are in preparation at the publisher without further details.
In short, wait and see.