
Well, from rumor to availability. Sony's newest eBook reading devices are now available for pre-order at J&R. 
The Sony PRS-300 is priced at $199:
http://www.jr.com/sony/pe/SON_PRS300RC/
The Sony PRS-600 is priced at $299:
http://www.jr.com/sony/pe/SON_PRS600SC/
Some interesting items found in the information for these devices.
For the PRS-300:
- USB 2.0 Data and power connection
 
- Intuitive eBook Library software for PC and Mac
 
- 512MB of onboard Memory lets you carry up to 350 of your favorite books at a time.
 
For the PRS-600
- Touchscreen navigation
 
- Freehand highlighting and annotation
 
- Built-in Oxford American English eDictionary
 
- Intuitive eBook Library software for PC & Mac
 
- 512MB of onboard Memory
 
Available accessories for both units include a car charger for $29 and a cover w/light for $54.
Interestingly there is no mention of any memory card slot on either device. Of course, that doesn't mean neither has them.
The file formats on both appear to be the same as the current PRS505/700 including BBeB (lrf/lrx), ePub and PDF with and without Adobe DRM, rtf and txt files. Still no html support. 
Finally there is no mention of expected ship dates. Just a "notify me when available" button.
Get your orders in now.
Thanks to member 
komugi for this find. There's plenty of discussion on these devices found here: 
https://www.mobileread.com/forums/showthread.php?t=52303
UPDATE 8/2 18:00 EDT.... apparently J&R has pulled these pre-order pages down. I assume this means they jumped the gun however it does show that Sony is very close to announcing these rumored devices.