It appears, according to a one-sheet sent to TmoNews, that Dell Streak 7 4G tablet will be released on February 2nd, 2011. Last we heard of this device, it was way back on the 14th of January and they said it'd be A Couple More Weeks At Least - they weren't fooling!
Furthermore, TmoNews has heard from a ninja (really, a ninja) that Samsung Galaxy Tab will be ending it's life (with Seppuku) at the end of January. This can be further substantiated by the recent price drops both in the USA and in Canada. This will more than likely make way for a 4G version of the tablet sometime in the near future (Mobile World Congress 2011? We'll be there to let you know!)