Xbox Canada Community Manager Raj Patel has tweeted this image:
The image has morse code and has been translated with help from the NeoGAF community which translates to
“Presented by Xbox, 10am PDT, 1pm EST, May 4th 2015”
The day coincides with Star Wars day which is the unofficial day of the franchise. However, that being said, it may not be related at all and could be entirely different.