FM Radio = No
Stereo speakers = Yes (side-facing)
Battery life = According to Samsung website:
Battery, Standby Up to 2230 Hours**
Battery Type and Size Li-Polymer, 8,220mAh
Music Play Time Up to 98 Hours*
Video Play Time Up to 10 Hours*
Internet Use Time WiFi: 9 hours

*Results are based on lab environment testing. Refer to your network carrier’s website for network specific talk times.

**Battery power consumption depends on factors such as network configuration, signal strength, operating temperature, features selected, vibrate mode, backlight settings, browser use, frequency of calls and voice, data and other applications usage patterns.

Source: Samsung US website (SM-P600)

Just any regular so card because they are universal.

Yes you can view and edit Microsoft files (Word, Excel, PowerPoint) granted with some limitation. Some of the known apps are Polaris Office (which I believe comes preinstalled) , OfficeSuite DocumentsToGo, Quickoffice, Kingsoft Office. Recently Microsoft published their own app "Office Mobile for Office 365" ,but you will have to be an Office 365 subscriber.

In my personal experience if you are looking to simply add or edit text and excel tables then you could go with the apps support. But if you are looking for the full office experience I suggest you take a look at Microsoft Surface 2 (Office 2013 RT preinstalled). It all comes down to your usage.