TNW reports that Microsoft Senior Director of Windows Phone Apps, Todd Brix, has told them that in the last 60 days Windows Phone App Downloads and Developer Revenue has doubled.
Microsoft did not reveal the reasons behind the change, but a few theories are probable:
1) a large number of new Windows Phone users.
2) a large number of new devices purchased by existing owners, stimulating new app downloads.
3) new revenue generating avenues via in-app purchases.
It is most likely a combination of 1 and 2, and of course most of us hope that the main reason is a massive influx of new Windows Phone users.
It is unlikely that Microsoft will clarify the issue at any point, but all by itself a large increase in revenue and downloads is just what Windows Phone needs to attract new developers and keep existing ones.
Related to this Microsoft is running a Developer App contest with the prize being having you app featured on a TV spot in US. Smaller prizes also include Nokia Lumia 920 phones. The contest is open to entrants worldwide. Read more about that here.