There aren't any new rumors yet about the subject of that press event but based on other leaks from today and in the past it is more than likely going to involve the next Nexus 7. A couple hours ago Android Central posted a photo which shows a partial screenshot of an inventory page. Some unnamed retailer is going to be carrying the "Nexus 2 7 inch Quad-Core", with retail prices starting at $229.
I could be jumping the gun on this, but I don't think so. The current Nexus 7 is over a year old, so it's really past time for it to be replaced with a new model. And there have been rumors that the new Nexus 7 will ship this month. And if that doesn't convince you, DigiTimes said that the new Nexus 7 would ship this month and cost $229. So you know that must be the factual truth.
Update: Engadget has a photo of internal docs from OfficeMax. They mention the Nexus 7 as coming in next week.
According to a carefully planned leak by an Asus rep, the Nexus 7 2 will 7" screen with a resolution of 1980x1200. It will be powered by a Qualcomm quad-core Snapdragon 600 SoC (APQ8064) with 2GB Ram, 16GB storage, and have a pair of cameras (5MP and 1.2MP). In terms of connectivity, the FCC filings revealed that this tablet will have Wifi, Bluetooth, and NFC. There will also be versions supporting LTE, WCDMA and GSM wireless connectivity.
The photo at right was revealed a few weeks back on the Bluetooth SIG website, confirming that the new Nexus 7 will look like an Android tablet.
P.S. No matter what the announcement is, you will be able to watch it live. The event is going to be livestreamed on Google’s YouTube channel.