Samsung is preparing quite a few products, but the number might be higher than anyone had expected, and I wouldn't have found out so quickly if it hadn't been for User Agent Profiles and Ameblo leaking a certain tidbit.
Essentially, Samsung is preparing to launch two tablets it hasn't spoken about up to now: SM-P600 and SM-P900 (with SM-P601, SM-P605, SM-P901 and SM-P905 derivatives).
They will have high-quality displays with a resolution of 2560 x 1600 pixels (aka WQXGA). I suppose that means they will have 10.1-inch screens.
In fact, the SM-P900 might turn out to be a higher-end Galaxy Tab 3 10.1.
The SM-P600 might turn out to be an 8-inch model instead of a 10.1-incher, but it's all still speculation.
In fact, all we know for sure, besides the screen resolution, is that the slates will possess Wi-Fi, 3G and LTE connectivity, plus Android 4.2 Jelly Bean operating system.