Perhaps there is a cap on the planet number for the beta, but i would assume they (the devs) would want us playing the immense galaxies with thousands of planets to check on the memory issue affecting those types of big planet/galaxy games.....
I'd expect that the planet counts at the moment are going to be on par with DA 1.

. Memory is probably going to continue to be the limiting factor until the new planet texture system is completely in and the old one is eliminated.... with that hog gone, things should really be able to open up.