EA will be using a point-but system for stats, which often floors your stats at 8, and may require you to spend all your points before continuing character creation. So probably no threes, but you could go for 15s in Wis, Cha, and Str, with 8s in all the stats that actually matter to a wizard.

When EA or release eventually introduces rolled stats, we’re not quite sure what limits they’ll include. But it’s more likely that you’ll be able to have intentionally low stats, as long as you’re willing to spend time rerolling.