According to Zac Bowden

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We've been referring to the increasingly close Surface Duo for a few days. Microsoft's new proposal in the field of telephony that launches the market for two folding screens, at least in the case of the American company and that in turn once marked the debut of Android.
With specifications that seem to end up becoming real, some specialists, in the case of Zac Bowden, pointed to a launch before the month of August. Something that also gained strength with photos of heavyweights from Microsoft in which the Surface Duo was the protagonist. We have seen it in the hands of Panos Panay or Frank X.Shaw, Microsoft Corporate Vice President. And now it looks like the Surface Duo may delay its release
Scheduled Delay
That is at least what is announced, again in this case, Zac Bowden. The well-known analyst announces on his Twitter account that although Microsoft was expected to launch the Surface Duo before August, this may have seen its launch delayed.
This is not a long delay, as it states that the announcement would take place sometime during the summer, but it is later than originally planned.
It should be remembered that, according to Bowden, the Surface Duo would have been launched early to advance its arrival to that of the new Galaxy Fold 2 , which many pointed out would arrive at Samsung's unpacked event in August, which this year will take place on the fifth of that month.An event to present the new Note each year. And now, the indications point to the fact that the Galaxy Fold 2 will almost certainly arrive later.
The absence of the Galaxy Fold 2 at the Samsung event on August 5 could be more than enough reason to see how the Surface Duo arrives later. Microsoft doesn't have the urgency to get ahead of a direct competitor. But it could also be motivated by a need on Microsoft's part to tune up its device Also, let's remember, when it was announced in October, the Duo, like the Surface Neo, they were announced for the end of the year, so the advancement that was being talked about was quite a surprise.
Via | Zac Bowden on Twitter