What’s this you say? These were some in-house newsletters. Although the cover of the first one (yes, even though it’s #3) seems to imply they were going to be sent to subscribers of The Dragon. Anyway, I’ve never read any of these in their entirety – only what’s available from the scans on The Acaeum. What’s available there has some interesting tidbits.
Acaeum says May. Also the last part of the first page mentions Eldritch Wizardry has been successfully published, which implies this came out slightly later in May (or, at least slightly later than Eldritch Wizardry in terms of order which may have come out as early as April 27).