like literally i never see any sombra stuff on tumblr but this was uncovered recently (10 hours ago as of now) by redditers
this is probably her ult icon if not a skill (source)
and on the official battle.net forums theres this account named skycoder that titled a forum using binary code that translates to 23, hinting that sombra may be the 23rd hero!
not only that, blizzard uploaded a new video for reaper, but it glitched (intentionally) and was quickly analyzed. no one knows what it means yet, though.
and even before this new stuff surfaced, fans have been cracking sombras codes for a long time. in the recent teaser for the summer games, a string of code can be seen following tracer as she zooms forward. and even more codes were found and cracked, some resulting in really interesting spanish sentences left by sombra.
one reads :“Parecen estar muy interesados en estos "héroes”. ¿Tal vez les interese conocer algunos detallitos que he averiguado sobre ellos?“
and in english is translated to "You seem to be very interested in those "heroes”. ¿Maybe you might be interested into knowing some tiny details I found about them?“