Ever since the unexpected delay between XE12 and XE16, the Glass team has been in a near rapid-fire mode with the OTAs. There were a staggering 5 updates of XE16 in the month of April (6 if you count the 2-parter with XE 12.1) and 3 official versions of XE17 during the month of May. As it turns out, there may be a fourth, unreleased May update to Google's experimental wearable.

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