The invite, which you can see below, asks the press to "please join us for an update on our tv business". Between the image of the couch, popcorn, and the mention of tv, it would seem Amazon is confirming all of the leaks which have been circulating over the past few months.
Rumors have been circulating for well over a year now that Amazon was working on a media streaming device, but it was only in the past few months that the density of the rumors was high enough to suggest that the device existed and was about to launch.
At this point we still don't know the name, price, or abilities, but recent leaks suggest that next week Amazon will unveil a dongle-shaped media streaming device. It's expected to run Android and will ship with a number of competing video services, including Hulu and Netflix.
According to a leaked planogram, Best Buy is expecting to carry it in May. That planogram also suggests that the upcoming device will have Wifi.