I notice a lot of people have been mentioning multiclassing as a solution to narrow class roles. While it may be a solution, all the information I've heard up to this point is somewhat contrary to that.
What it seems like, based on the mention of the Class Training feats, is that you can't do 3E-style "Rogue 5/Fighter 5" style multiclassing. Instead, you have a class, and then you can use feats to get specific abilities from other classes (might be almost all their abilties, might be just a few). So right off the bat, you're going to be burning a lot of feats if you want anything like an even split - it's better suited to, in 3E terms, dipping.
Secondly, there's the issue that if other classes are limited to specific weapons like the Rogue is, their abilties won't have any practical synergy when multiclassed. If I'm trying to multiclass Fighter and Rogue, but the Fighter abilties are geared to polearms, maces, and heavy swords, then they don't really combine at all. Which was the reason 3E caster-multiclassing sucked, BTW - having two abilities you can use one at a time isn't the same as having two abilties that synergize, or one stronger ability.
Now I may be wrong on this - the information released has been limited, and things may have changed since then. However, there's equally no indication that you can do anything like a 3E multiclassed hybrid. So I don't think it's a relevant solution at the present time.