Got my Galaxy Tab 2 yesterday. I didn't have much time to play with it, but I can confirm that the 50 GB Dropbox plan is for real.
I set up my wifi network and entered my gmail account info. The tablet automatically "restored" all of the apps I already have installed on my Galaxy Nexus phone. When I logged into Dropbox (via the app) it showed the "get 50 GB with your next picture upload). I snapped a quick picture, it automatically synced to Dropbox, and I am now up to 51.25 GB of storage. ^
Definitely need to get a case for it.