Well if it doesn't appear at Microsoft's conference then it means either two possible scenarios :
-1) It is (timed) exclusive ,so we hafta wait for Sony's or Nintendo (why even Nintendo's? Because back in 2001, when biohazad remake was announced it was a Nintendo Gamecube exclusive along with other biohazard games. Shinji Mikami, head of Capcom Production Studio 4 back at the time, was proud to announce that his division should be primarily handling-creating Nintendo Gamecube games. So how could anyone rule out the possibility that the second canonical remake of a canon biohazard game, i.e. BIOHAZARD 2, might end up as a Switch game...)
-2) Or start waiting for Tokyo Game Show