Based on some recent details discovered on Samsung's User Agent Profile (UAProf) website, it looks like the company is prepping a few new tablets. Specifically, these appear to be the SM-P900 series which includes three models. The models are listed as being the P900, P901 and P905.
The UAProf listing has these tablets as running Android 4.2 Jelly Bean and sporting display resolutions of 2560 x 1600. These are also shown to have an ARM 11 processor. Looking at each of these models and we find the P901 to be WiFi only. The P900 and P905 will have WiFi connectivity with the 900 also having 3G and the 905 also having 3G and LTE.
It is worth noting that the 2560 x 1600 display resolution matches what we have seen with the Nexus 10. There are still plenty of missing details on this tablet line at the moment, however these are said to be coming as the Galaxy Tab 3 Plus family and are expected to get an official announcement later in the year. That announcement is expected during IFA which takes place in September.
Judging from the P in the model numbers, these are also not expected to include the S Pen. Of course, that is also tied in with the belief these are Galaxy Tab models as opposed to Galaxy Note models. Bottom line here, this is still early bits of information on the SM-P90x family of tablets, however with the little we do know, it does appear to be one worth watching.