Well again, take out the announcement for a second- will you still buy the EM1 Mark III in today's market considering all the competitors that may be a match for your needs and wants? If the answer is YES, then yes, I would say go ahead an buy it (read what I posted why I think that makes sense).
Also assumes you have some m43rds lenses, that this is not your first investment in the system.
Basically the reasons you would have bought an EM1MKIII over anything in the market really don't change. The only exception would be if you are the kind of photographer that needs to send their equipment to the manufacturers for cleaning/repair often because you are shooting in the Sahara dessert after jumping off an airplane regularly or something extreme like that