I haven't had a chance to put my hands on the beagle (txtr seems determined to lend it to everyone except me), but I do know something about it.
This device excited us all when it was announced back in October, but once the all the details had been revealed it became much less appealing. The thing is, this isn't an ereader. It doesn't let you read ebooks; no, it displays page images.
The beagle is perhaps the most well-known faux-ereader, on or off the market. It has a 5" E-ink screen, and can hold the equivalent of 5 ebooks as folders of page images (manga fans, eat your heart out). Content is transferred to the beagle over Bluetooth, and it requires txtr's reading app on a late model Android smartphone running Android 4.0 or above.
There's no word yet on when this device will hit the market, but the last I heard was that txtr wasn't planning to introduce it to the US market any time soon. But now that it's cleared the FCC I wonder if that is correct.
When it is on the market you will only be able to get it from a cell phone company the next time you get a new smartphone and contract. Txtr isn't planning to allow for direct to consumer sales.